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              acrosome
               基礎(chǔ)科學(xué) 
              
				
              

										 
                      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] >> 
               
			  
				 
              
				 
				
				
              
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