VPS54 and Globozoospermia: Amongst the other globozoospermia mouse mutants, the abnormalities observed in AU040320-null mice at this particular step resemble, in different degrees, those observed for KO mice for Hrb40, Gopc41, Mfsd14a49, Tmf150, GM13051 and Pick142, or in the Vps54-L967Q mouse52.