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Late Holocene hydroclimatic change at Cienega Amarilla, west-central New Mexico, USA

Published online by Cambridge University Press:  06 February 2017

Jill Onken*
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, Arizona 85721, USA
Susan J. Smith
Affiliation:
Consulting Archaeopalynologist, 8875 Carefree Ave., Flagstaff, Arizona 86004, USA
Manuel R. Palacios-Fest
Affiliation:
Terra Nostra Earth Sciences Research, P.O. Box 37195, Tucson, Arizona 85740, USA
Karen R. Adams
Affiliation:
Archaeobotanical Consultant, 2837 E. Beverly Dr., Tucson, Arizona 85716, USA
*
*Corresponding author at: Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ 85721, United States. E-mail address: jonken@email.arizona.edu (J. Onken).

Abstract

A late Holocene carbonate spring mound and associated wetland deposits at Cienega Amarilla, New Mexico, contain a 4000-yr record of geomorphic, paleoenvironmental, and hydroclimatic change on the southern Colorado Plateau. Forty-four 14C dates support a century-scale chronostratigraphic framework. Pollen, plant macrofossil, mollusk, ostracode, and soil analyses indicate rapid spring mound growth and wetland expansion beginning ~2300 cal yr BP, followed by a pronounced decline in groundwater discharge (GWD) between ~1500 and 1000 cal yr BP. The isotopic composition of Cienega Amarilla springwater suggests GWD is driven primarily by winter precipitation. Historical climate data indicate that El Niño and warm Pacific Decadal Oscillation (PDO) conditions foster wetter-than-average winters in the Cienega Amarilla area, whereas dry winters are associated with La Niña conditions regardless of PDO phase. The ~2300–1500 cal yr BP Cienega Amarilla pluvial appears to represent an interval of peak, late Holocene cool-season precipitation that implies unusually strong or persistent El Niño–like and warm PDO–like conditions in the Pacific. Other southwestern paleoenvironmental records corroborate atypically wet conditions during this interval, and pluvial conditions related to increased winter precipitation likely fostered significant prehistoric cultural changes throughout the region, including increased sedentism, population, and dependence on agriculture.

Type
Research Article
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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References

Adams, D.K., Comrie, A.C., 1997. The North American monsoon. Bulletin of the American Meteorological Society 78, 21972213.2.0.CO;2>CrossRefGoogle Scholar
Akers, J.P., 1964. Geology and ground water in the central part of Apache County, Arizona. Geological Survey Water-Supply Paper 1771. US Government Printing Office, Washington, D.C.Google Scholar
Anderson, K.C., Potter, J.M., 2015. Chronostratigraphic and paleoenvironmental evidence for marsh habitats during the Early Pueblo I (AD 700–900) occupation of Ridges Basin, southwest Colorado, USA. Geoarchaeology: An International Journal 30, 110119.CrossRefGoogle Scholar
Andrade, E.R. Jr., Sellers, W.D., 1988. El Niño and its effect on precipitation in Arizona and western New Mexico. Journal of Climatology 8, 403410.CrossRefGoogle Scholar
Asmerom, Y., Polyak, V., Burns, S., Rassmussen, J., 2007. Solar forcing of Holocene climate: new insights from a speleothem record, southwestern United States. Geology 35(1), 14. http://dx.doi.org/10.1130/G22865A.1.Google Scholar
Barron, J.A., Anderson, L., 2011. Enhanced late Holocene ENSO/PDO expression along the margins of the eastern North Pacific. Quaternary International 235, 312.Google Scholar
Barry, R.G., Chorley, R.J., 1998. Atmosphere, Weather and Climate. 7th ed. Routledge, London.Google Scholar
Basabilvazo, G.T., 1997. Ground-Water Resources of Catron County, New Mexico. US Department of the Interior, US Geological Survey, Albuquerque, NM.Google Scholar
Basch, P., 1963. A review of the recent freshwater Limpet snails of North America (Mollusca: Pulmonata). Bulletin of the Museum of Comparative Zoology at Harvard College 129(8), 399461.Google Scholar
Brown, D.P., Comrie, A.C., 2004. A winter precipitation “dipole” in the western United States associated with multidecadal ENSO variability. Geophysical Research Letters 31, L09203. http://dx.doi.org/10.1029/2003GL018726.Google Scholar
Bryson, R.A., Hare, F.K., 1974. The climates of North America. In: Bryson, R.A., Hare, F.K. (Eds.), Climates of North America. Elsevier, New York, pp. 147.Google Scholar
Chamberlain, R.M., Cather, S.M., Anderson, O.J., Jones, G.E., 1994. Reconnaissance Geologic Map of the Quemado 30 x 60 Minute Quadrangle, Catron County, New Mexico. Open-File Report 406. New Mexico Bureau of Mines and Mineral Resources, Socorro, NM.Google Scholar
Conroy, J.L., Overpeck, J.T., Cole, J.E., Shanahan, T.M., Steinitz-Kannan, M., 2008. Holocene changes in eastern tropical Pacific climate inferred from a Galápagos lake sediment record. Quaternary Science Reviews 27, 11661180. http://dx.doi.org/10.1016/j.quascirev.2008.02.015.CrossRefGoogle Scholar
Cook, B.I., Smerdon, J.E., Seager, R., Cook, E.R., 2014. Pan-continental droughts in North America over the last millennium. Journal of Climate 27, 383397.Google Scholar
Cook, E.R., Woodhouse, C.A., Eakin, C.M., Meko, D.M., Stahle, D.W., 2004. Long-term aridity changes in the western United States. Science 306, 10151018. http://dx.doi.org/10.1126/science.1102586.Google Scholar
Copeland, A., Quade, J., Watson, J.T., McLaurin, B.T., Villalpando, E., 2012. Stratigraphy and geochronology of La Playa archaeological site, Sonora, Mexico. Journal of Archaeological Science 39, 29342944. http://dx.doi.org/10.1016/j.jas.2012.04.034.Google Scholar
Cordell, L.S., McBrinn, M.E., 2012. Archaeology of the Southwest. 3rd ed. Left Coast Press, Walnut Creek, CA.Google Scholar
Dean, J.S., 1988. Dendrochronology and paleoenvironmental reconstruction on the Colorado Plateaus. In: Gumerman, G.J. (Ed.), The Anasazi in a Changing Environment. Cambridge University Press, Cambridge, pp. 119167.Google Scholar
Eastoe, C.J., Gu, A., Long, A., 2004. The origins, ages and flow paths of groundwater in Tucson basin: results of a study of multiple isotope systems. In: Hogan, J.F., Phillips, F.M., Scanlon, B.R. (Eds.), Groundwater Recharge in a Desert Environment—The Southwestern United States. Water Science and Application 9. American Geophysical Union, Washington, DC, pp. 217234.Google Scholar
Embid, E.H., 2009. U-Series Dating, Geochemistry, and Geomorphic Studies of Travertines and Springs of the Springerville Area, East-Central Arizona, and Tectonic Implications. Master’s thesis, University of New Mexico, Albuquerque.Google Scholar
Evanoff, E., 1987. Appendix 4: fossil nonmarine snails from the Horner Site. In: Frison, G.C., Todd, L.C. (Eds.), The Horner Site: The Type Site of the Cody Complex. Academic Press, Orlando, FL, pp. 443450.Google Scholar
Fritts, H.C., 2001. Tree Rings and Climate. Blackburn Press, Caldwell, NJ.Google Scholar
Forester, R.M., 1988. Nonmarine calcareous microfossil sample preparation and data acquisition procedures. US Geological Survey Technical Procedure HP-78, R1, 19.Google Scholar
Forester, R.M., 1991. Ostracode assemblages from springs in the western United States: implications for paleohydrology. Memoirs of the Entomological Society of Canada 155, 181201.Google Scholar
Forester, R.M., Smith, A.J., 1994. Late glacial climate estimates for southern Nevada: the ostracode fossil record. Proceedings of the 5th Annual International High-Level Radioactive Waste Management Conference and Exposition, Las Vegas, Nevada, May 22–26, 1994. American Nuclear Society, LaGrange, IL, vol. 4, pp. 25532561.Google Scholar
Grissino-Mayer, H.D., 1996. A 2129-year reconstruction of precipitation for northwestern New Mexico, USA. In: Dean, J.S., Meko, D.M., Swetnam, T.W. (Eds.), Tree Rings, Environment, and Humanity: Proceedings of the International Conference, Tucson, Arizona, 17–21 May 1994. Radiocarbon, Department of Geosciences, University of Arizona, Tucson, pp. 191–204.Google Scholar
Grissino-Mayer, H.D., Swetnam, T.W., Adams, R.K., 1997. The rare old-aged conifers of El Malpais: their role in understanding climate change in the American Southwest. New Mexico Bureau of Mines and Mineral Resources Bulletin 156, 155161.Google Scholar
Guan, H., Vivoni, E.R., Wilson, J.L., 2005. Effects of atmospheric teleconnections on seasonal precipitation in mountainous regions of the southwestern U.S.: a case study in northern New Mexico. Geophysical Research Letters 32, L23701. http://dx.doi.org/10.1029/2005GL023759.Google Scholar
Hall, S.A., Penner, W.L., 2013. Stable carbon isotopes, C3–C4 vegetation, and 12,800 years of climate change in central New Mexico, USA. Palaeogeography, Palaeoclimatology, Palaeoecology 369, 272281. http://dx.doi.org/10.1016/j.palaeo.2012.10.034.Google Scholar
Hall, S.A., Penner, W., Ellis, M., 2009. Arroyo cutting and vegetation change in Abo Canyon, New Mexico: evidence from repeat photography along the Santa Fe Railway. In: Lueth, V.W., Lucas, S.G., Chamberlin, R.M. (Eds.), Geology of the Chupadera Mesa: New Mexico Geological Society 60th Annual Field Conference, October 7–10, 2009. New Mexico Geological Society, Socorro, NM, pp. 429–438.Google Scholar
Hasbargen, J., 1994. A Holocene paleoclimatic and environmental record from Stoneman Lake, Arizona. Quaternary Research 42, 188196.Google Scholar
Haynes, C.V. Jr., 2008. Quaternary cauldron springs as paleoecological archives. In: Stevens, L.E., Meretsky, V.J. (Eds.), Aridland Springs in North America: Ecology and Conservation. University of Arizona Press, Tucson, pp. 7697.Google Scholar
Hershler, R., Sada, D.W., 2002. Biogeography of Great Basin aquatic snails of the genus Pyrgulopsis . In: Hershler, R., Madsen, D.B., Currey, D.R. (Eds.), Great Basin Aquatic Systems History. Smithsonian Contributions to the Earth Sciences 33. Smithsonian Institution, Washington, DC, pp. 255276.Google Scholar
Huber, E.K., 2005. Settlement patterns in the Fence Lake Project area. In: Huber, E.K., Van West, C.R. (Eds.), Fence Lake Project: Archaeological Data Recovery in the New Mexico Transportation Corridor and First Five-Year Permit Area, Fence Lake Coal Mine Project, Catron County, New Mexico. Vol. 4, Synthetic Studies and Summary. Technical Series 84. Statistical Research Inc., Tucson, AZ, pp. 39.139.53.Google Scholar
International Atomic Energy Agency and World Meteorological Organization. 2015. Global Network of Isotopes in Precipitation (GNIP) Database (accessed October 8, 2015). http://www-naweb.iaea.org/napc/ih/IHS_resources_gnip.html.Google Scholar
Janitzky, P., 1986. Organic carbon (Walkley-Black method). In: Singer, M.J., Janitsky, P. (Eds.), Field and Laboratory Procedures Used in a Soil Chronosequence Study. US Geological Survey Bulletin 1648. US Government Printing Office, Washington, DC, pp. 3033.Google Scholar
Karanovic, I., 2012. Recent Freshwater Ostracods of the World: Crustacea, Ostracoda, Podocopida. Springer, Heidelberg, Germany.CrossRefGoogle Scholar
Kiladis, G.N., Diaz, H.F., 1989. Global climate anomalies associated with extremes of the Southern Oscillation. Journal of Climate 2, 10691090.Google Scholar
Kreamer, D.K., Springer, A.E., 2008. The hydrology of desert springs in North America. In: L.E. Stevens, Meretsky, V.J. (Eds.), Aridland Springs in North America: Ecology and Conservation. University of Arizona Press, Tucson, pp. 3548.Google Scholar
Kurtzman, D., Scanlon, B.R., 2007. El Niño–Southern Oscillation and Pacific Decadal Oscillation impacts on precipitation in the southern and central United States: evaluation of spatial distribution and predictions. Water Resources Research 43, W10427. http://dx.doi.org/10.1029/2007WR005863.Google Scholar
Lebron, I., Herrero, J., Robinson, D.A., 2009. Determination of gypsum content in dryland soils exploiting the gypsum–bassanite phase change. Soil Science Society of America Journal 73, 403411. http://dx.doi.org/10.2136/sssaj2008.0001.CrossRefGoogle Scholar
Lenart, M., 2006. El Niño: a wild card for climate change impacts. Southwest Climate Outlook (January 24), 2–4. http://www.climas.arizona.edu/sites/default/files/janpacket2006_1.pdf.Google Scholar
Mabry, J., 2005. Diversity in early southwestern farming systems and optimization models of transitions to agriculture. In: Diehl, M.W., (Ed.), Subsistence and Resource Use Strategies of Early Agricultural Communities in Southern Arizona. Anthropological Papers No. 34. Center for Desert Archaeology, Tucson, AZ, pp. 113–152.Google Scholar
Machette, M., 1986. Calcium and magnesium carbonates. In: Singer, M.J., Janitsky, P. (Eds.), Field and Laboratory Procedures Used in a Soil Chronosequence Study. US Geological Survey Bulletin 1648. US Government Printing Office, Washington, DC, pp. 3033.Google Scholar
Magnani, M.B., Miller, K.C., Levander, A., Karlstrom, K., 2004. The Yavapai-Mazatzal boundary: a long-lived tectonic element in the lithosphere of southwestern North America. Geological Society of America Bulletin 116, 11371142.Google Scholar
Mayewski, P.A., Rohling, E.E., Stager, J.C., Karlén, W., Maasch, K.A., Meeker, L.D., Meyerson, E.A., et al., 2004. Holocene climate variability. Quaternary Research 62, 243255. http://dx.doi.org/10.1016/j.yqres.2004.07.001.Google Scholar
Mayo, E.B., 1958. Lineament tectonics and some ore districts of the Southwest. Mining Engineering 10, 11691175.Google Scholar
McGregor, H.V., Gagan, M.K., 2004. Western Pacific coral δ18O records of anomalous Holocene variability in the El Niño–Southern Oscillation. Geophysical Research Letters 31, L11204. http://dx.doi.org/10.1029/2004GL019972.CrossRefGoogle Scholar
Moore, J., Adams, M., Allis, R., Lutz, S., Rauzi, S., 2005. Mineralogical and geochemical consequences of the long-term presence of CO2 in natural reservoirs: an example from the Springerville–St. Johns Field, Arizona, and New Mexico, U.S.A. Chemical Geology 217, 365385.CrossRefGoogle Scholar
New Mexico Bureau of Geology and Mineral Resources. 2003. Geologic Map of New Mexico, Scale 1:500,000. New Mexico Bureau of Geology and Mineral Resources, Socorro, NM.Google Scholar
O’Brien, B.R., 1956. Geology of Cienega Amarilla Area, Catron County, New Mexico and Apache County, Arizona. Master’s thesis, University of Texas, Austin.Google Scholar
Ogle, D.G., St. John, L., Tilley, D., 2012. Plant Guide for Fourwing Saltbush (Atriplex canescens). US Department of Agriculture, Natural Resources Conservation Service, Plant Materials Center, Aberdeen, ID.Google Scholar
Onken, J., 2015. Late Quaternary Climatic Geomorphology, Volcanism, and Geoarchaeology of Carrizo Wash, Little Colorado River Headwaters, USA. PhD dissertation, University of Arizona, Tucson.Google Scholar
Palacios-Fest, M.R., 1994. Nonmarine ostracode shell chemistry from Hohokam irrigation canals in central Arizona: a paleohydrochemical tool for the interpretation of prehistoric human occupation in the North American Southwest. Geoarchaeology 9(1), 129.Google Scholar
Palacios-Fest, M.R., 2010. Late Holocene paleoenvironmental history of the upper west Amarillo Creek valley at archaeological site 41PT185/C, Texas, USA. Boletín de la Sociedad Geológica Mexicana 62, 399436.CrossRefGoogle Scholar
Parsons, E.C., 1939. Pueblo Indian Religion. University of Chicago Press, Chicago.Google Scholar
Pigati, J.S., Rech, J.A., Nekola, J.C., 2010. Radiocarbon dating of small terrestrial gastropod shells in North America. Quaternary Geochronology 5, 519532. http://dx.doi.org/10.1016/j.quageo.2010.01.001.Google Scholar
Pigati, J.S., Rech, J.A., Quade, J., Bright, J., 2014. Desert wetlands in the geologic record. Earth-Science Reviews 132, 6781. http://dx.doi.org/10.1016/j.earscirev.2014.02.001.Google Scholar
Pigati, J.S., Quade, J., Shahanan, T.M., Haynes, C.V. Jr., 2004. Radiocarbon dating of minute gastropods and new constraints on the timing of late Quaternary spring discharge deposits in southern Arizona, USA. Palaeogeography, Palaeoclimatology, Palaeoecology 204, 3345. http://dx.doi.org/10.1016/S0031-0182(03)00710-7.Google Scholar
Polyak, V.J., Asmerom, Y., 2001. Late Holocene climate and cultural changes in the southwestern United States. Science 294, 148151. http://dx.doi.org/10.1126/science.1062771.Google Scholar
Poore, R.Z., Pavich, M.J., Grissino-Mayer, H.D., 2005. Record of the North American southwest monsoon from Gulf of Mexico sediment cores. Geology 33(3), 209212. http://dx.doi.org/10.1130/G21040.1.Google Scholar
Quade, J., Forester, R.M., Pratt, W.L., Carter, C., 1998. Black mats, spring-fed streams, and late-glacial-age recharge in the southern Great Basin. Quaternary Research 49, 129148. http://dx.doi.org/10.1006/qres.1997.1959.Google Scholar
Quade, J., Rech, J.A., Betancourt, J.L., Latorre, C., Quade, B., Rylander, K.A., Fisher, T., 2008. Paleowetlands and regional climate change in the central Atacama Desert, northern Chile. Quaternary Research 69, 343360. http://dx.doi.org/10.1016/j.yqres.2008.01.003.Google Scholar
Ramsey, C.B., 2009. Bayesian analysis of radiocarbon dates. Radiocarbon 51, 337360.Google Scholar
Rea, A.M., 2008. Historic and prehistoric ethnobiology of desert springs. In: Stevens, L.E., Meretsky, V.J. (Eds.), Aridland Springs in North America: Ecology and Conservation. University of Arizona Press, Tucson, pp. 268278.Google Scholar
Reimer, P.J., Bard, E., Bayliss, A., Beck, J.W., Blackwell, P.G., Ramsey, C.B., Buck, C.E., 2013. IntCal13 and Marine13 radiocarbon age calibration curves 0–50,000 years cal BP. Radiocarbon 55(4), 18691887.Google Scholar
Salzer, M.W., 2000. Dendroclimatology in the San Francisco Peaks Region of Northern Arizona, USA. PhD dissertation, University of Arizona, Tucson.Google Scholar
Schumacher, B.A., 2002. Methods for the determination of total organic carbon (TOC) in soils and sediments. NCEA-C- 1282, EMASC-001. US Environmental Protection Agency, Washington, DC.Google Scholar
Sheppard, P.R., Comrie, A.C., Packin, G.D., Angersbach, K., Hughes, M.K., 2002. The climate of the US Southwest. Climate Research 21, 219238.Google Scholar
Simms, S.R., 1987. Behavioral Ecology and Hunter-Gatherer Foraging: An Example from the Great Basin. British Archaeological Reports (BAR) International Series 381. BAR, Oxford.Google Scholar
Smith, S.J., 1998. Processing pollen samples from archaeological sites in the southwestern United States: an example of differential recovery from two heavy liquid separation procedures. In: Bryant, V.M., Wrenn, J.H. (Eds.), New Developments in Palynomorph Sampling, Extraction, and Analysis. Contributions Series No. 33. American Association of Stratigraphic Palynologists Foundation, Houston, TX, pp. 2934.Google Scholar
Smith, W., 1986. The Effects of Eastern North Pacific Tropical Cyclones on the Southwestern United States. NOAA Technical Memorandum NWS WR-197. US Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, Western Region, Salt Lake City, UT.Google Scholar
Trenberth, K.E., Branstator, G.W., Karoly, D., Kumar, A., Lau, N.C., Ropelewski, C., 1998. Progress during TOGA in understanding and modeling global teleconnections associated with tropical sea surface temperatures. Journal of Geophysical Research 103, 1429114324.Google Scholar
Trewartha, G.T., 1981. The Earth’s Problem Climates. University of Wisconsin Press, Madison.Google Scholar
Trouet, V., Diaz, H.F., Wahl, E.R., Viau, A.E., Graham, R., Graham, N., Cook, E.R., 2013. A 1500-year reconstruction of annual mean temperature for temperate North America on decadal-to-multidecadal time scales. Environmental Research Letters 8, 024008. http://dx.doi.org/10.1088/1748-9326/8/2/024008.Google Scholar
Truebe, S.A., Ault, T.R., Cole, J.E., 2010. A forward model of cave dripwater δ18O and application to speleothem records. IoP Conference Series: Earth and Environmental Science 9, 1–8.Google Scholar
Van West, C.R., Grissino-Mayer, H.D., 2005. Dendroclimatic reconstruction. In: Huber, E.K., Van West, C.R. (Eds.), Fence Lake Project: Archaeological Data Recovery in the New Mexico Transportation Corridor and First Five-Year Permit Area, Fence Lake Coal Mine Project, Catron County, New Mexico. Vol. 3, Environmental Studies. Technical Series 84. Statistical Research Inc., Tucson, AZ, pp. 33.133.129.Google Scholar
Viau, A.E., Gajewski, K., Fines, P., Atkinson, D.E., Sawada, M.C., 2002. Widespread evidence of 1500 yr climate variability in North America during the past 14,000 yr. Geology 30(5), 455458.Google Scholar
Wagner, J.D.M., Cole, J.E., Beck, J.W., Patchett, P.J., Henderson, G.M., Barnett, H.R., 2010. Moisture variability in the southwestern United States linked to abrupt glacial climate change. Nature Geoscience 3, 110113. http://dx.doi.org/10.1038/ngeo707.CrossRefGoogle Scholar
Walkley, A., Black, I.A., 1934. An examination of the Degtjareff method for determining organic carbon in soils: effect of variations in digestion conditions and of inorganic soil constituents. Soil Science 63, 251263.CrossRefGoogle Scholar
Wang, C., Deser, C., Yu, J.Y., DiNezio, P., Clement, A., 2016. El Niño and Southern Oscillation (ENSO): a review. In: Glynn, P., Manzello, D., Enochs, I. (Eds.), Coral Reefs of the Eastern Tropical Pacific: Persistence and Loss in a Dynamic Environment. Coral Reefs of the World 8. Springer, Berlin, pp. 85106.Google Scholar
Waters, M.R., Haynes, C.V., 2001. Late Quaternary arroyo formation and climate change in the American Southwest. Geology 29, 399402.Google Scholar
Western Regional Climate Center, 2016. Historical Data: Cooperative Climatological Data Summaries, Arizona (accessed June 15, 2016). http://www.wrcc.dri.edu/summary/Climsmaz.html.Google Scholar
Wigand, P.E., Rhode, D., 2002. Great Basin vegetation history and aquatic systems: the last 150,000 years. In: Hershler, R.S., Madsen, D.B., Currey, D.R. (Eds.), Great Basin Aquatic Systems History. Smithsonian Contributions to Earth Sciences 33. Smithsonian Institution Press, Washington, DC, pp. 309367.Google Scholar
Winograd, I.J., Riggs, A.C., Coplen, T.B., 1998. The relative contribution of summer and cool-season precipitation to groundwater recharge, Spring Mountains, Nevada, USA. Hydrogeology Journal 6, 7793.Google Scholar
Woodhouse, C.A., Meko, D.M., MacDonald, G.M., Stahle, D.W., Cook, E.R., 2010. A 1,200-year perspective of 21st century drought in southwestern North America. Proceedings of the National Academy of Sciences of the United States of America 107, 2128321288. http://dx.doi.org/10.1073/pnas.0911197107.Google Scholar
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