Houtsmuller, E.J.

caudal males caudal behavior female effect androgen testosterone uterine fetus difference level study group number uterine horn animal chapter sdn-poa experiment preference position sdn-poa volume hypothesis differentiation volume masculinization birth utero treatment result artery hormone partner control perinatal analysis uterus interaction pregnancy mother factor uterine artery litter ejaculation variable blood adult sex differences presence brain mannetje estrogen position phenomenon houtsmuller caesarean section transport adulthood species evidence prenatally caudally intromission behav lordosi clemen nucleus mount testosterone levels uterine vein variation contiguity procedure gerbil stimulus animals partner preference relationship androgen levels meisel section uterine vasculature