Endocrine Abstracts

We have investigated inter-individual transfer of 17β-estradiol (E2) and progesterone (P-4), and related it to mammalian ‘pheromonal’ effects. Assays of unconjugated E2 and P4 revealed their presence in male and female urine of laboratory mice and big brown bats (Eptesicus fuscus), which are phylogenetically very distant from each other. These small and lipophilic steroids readily pass through biological membr...