title: On the use of male rats for the biological diagnosis of pregnancy.
authors.forename: P
authors.initials: P
authors.lastname: ENGEL
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy / Q000175:diagnosis
keywords: PREGNANCY/diagnosis, diagnostic
vernacular_title: Sobre el empèeo de ratas machos para el diagnóstico biológico del embarazo.