知識貝殼
知識貝殼
所屬欄目：英漢雙解生物學
A membrane-bound structure inthe anterior head region of a spermatozoon,usually forming a cap over the nucleus. Itcontains enzymes that are released on contactwith the egg at fertilization and break downthe egg coats,enabling the spermatozoon nu-cleus to ......（本文共 296 字 ） [閱讀本文] >>