_:vb50939827 . _:vb50939827 . _:vb50939827 . _:vb50939827 . _:vb50939827 . _:vb50939827 "A male infertility due to acephalic spermatozoa that is characterized by acephalic spermatozoa, reduced sperm number and impaired sperm motility that has_material_basis_in homozygous mutation in the BRDT gene on chromosome 1p22."^^ . _:vb50939827 "url:https://www.ncbi.nlm.nih.gov/pubmed/28199965"^^ .