has part has part has_part characteristic of has modifier binding of sperm to zona pellucida impaired sperm-egg recognition impaired binding of sperm to zona pellucida 2019-09-16T10:05:38Z reduced ability or inability to execute the process in which the sperm binds to the zona pellucida glycoprotein layer of the egg; the process begins with the attachment of the sperm plasma membrane to the zona pellucida and includes attachment of the acrosome inner membrane to the zona pellucida after the acrosomal reaction takes place MP:0030978 MPheno.ontology abnormal decreased process quality