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Spermatozoa are mature male gametes that are produced in the testes of a healthy man by spermatogenesis, with further maturation of sperm taking place during their transit through the epididymis. In the human, approximately 20 to 240 million sperm are produced per day . Unlike other somatic cells present in the human body, spermatozoa contain a head, neck, mid-piece and tail region. The head region contains the genetic material which is transferred to the oocyte during the fertilization process. Apart from DNA, spermatozoa also deliver additional subcellular materials such as oocyte activating factors, RNA, microRNAs and exosomal proteins that are essential for the development of the oocyte into a zygote.
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