_:vb50946481 . _:vb50946481 "url:https://pubmed.ncbi.nlm.nih.gov/27640305/"^^ . _:vb50946481 . _:vb50946481 . _:vb50946481 . _:vb50946481 "A spermatogenic failure characterized by male infertility caused by a majority of spermatozoa lacking heads."^^ . _:vb50946481 .