_:vb50946428 . _:vb50946428 . . _:vb50946428 . "A spermatogenic failure characterized by infertility resulting from absence of oocyte activation and ultrastructural abnormalities of the sperm head that has_material_basis_in homozygous or compound heterozygous mutation in ACTL9 on chromosome 19p13.2."^^ . "SPGF53"^^ . . "DOID:0112279"^^ . "OMIM:619258"^^ . _:vb50946428 . "disease_ontology"^^ . "spermatogenic failure 53"^^ . . _:vb50946428 . .