Perinuclear theca

The perinuclear theca is a cytoskeletal structure that covers the nucleus of mammalian spermatozoa except for a narrow zone around the insertion of the tail. It shows two distinct regions, a subacrosomal layer or perforatorium and, continuing caudally beyond the acrosomic system, the postacrosomal sheath.

Source:http://purl.uniprot.org/locations/199

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The perinuclear theca is a cytoskeletal structure that covers the nucleus of mammalian spermatozoa except for a narrow zone around the insertion of the tail. It shows two distinct regions, a subacrosomal layer or perforatorium and, continuing caudally beyond the acrosomic system, the postacrosomal sheath.
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Perinuclear theca
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perinuclear theca