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Introduction and oxidation of catechols during the formation of the skate (Raja erinacea) egg capsule

Published online by Cambridge University Press:  11 May 2009

Thomas J. Koob
Affiliation:
Mount Desert Island Biological Laboratory, Salsbury Cove, Maine, USA '
David L. Cox
Affiliation:
Mount Desert Island Biological Laboratory, Salsbury Cove, Maine, USA ' Department of Biology, University of Oregon, Eugene, Oregon, USA

Abstract

Tanning of the Raja erinacea egg capsule occurs after secretion of capsule precursors from the nidamental gland and involves the introduction of catechols and their subsequent oxidation to quinones by catechol oxidase. At the time of secretion and assembly of capsular precursors in the nidamental gland, the capsule is white, contains no catechols and lacks chemical and mechanical stability. Following formation in the nidamental gland, catechols accumulate in utero in parallel with colour development. An inactive form of catechol oxidase is incorporated in the capsular matrix at the time of secretion. Catechol oxidase activity increases concomitantly with increasing catechol content and colour development.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1990

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