Current medical student interviewers add data to the evaluation of medical school applicants.

Background: There is evidence that the addition of current medical student interviewers (CMSI) to faculty interviewers (FI) is valuable to the medical school admissions process. This study provides objective data about the contribution of CMSI to the admissions process.

Method: Thirty-six applicants to a 4-year medical school program were interviewed by both CMSI and FI, and the evaluations completed by the two groups of interviewers were compared.

Perinatal exposure to progesterone, estradiol, or mifepristone affects sexual differentiation of behavior in opossums (Monodelphis domestica).

The effects of perinatal exposure to progesterone (P) and estradiol (E) on sexual differentiation of behavior and morphology were examined by treating male and female gray short-tailed opossums on postnatal day 8 with progesterone alone (P), P plus estradiol (E) (PE), the P receptor antagonist mifepristone/RU486 (MIF), or corn oil control (C) and gonadectomizing them before puberty. When given female hormone replacement therapy in adulthood and tested with intact stimulus males, MIF animals showed less female-typical aggressive threat behavior than animals in other treatment groups. Stimulus males scent marked in more tests involving females than males and in more tests involving MIF animals than animals in other treatment groups.

Progesterone receptor in the forebrain of female gray short-tailed opossums: effects of exposure to male stimuli.

Progesterone receptor immunoreactivity (PRir) in brain areas involved in reproductive behavior in eutherian species was examined for the first time in a female marsupial, the gray short-tailed opossum (Monodelphis domestica, hereinafter, opossum). PRir in nuclei of neurons, measured as area covered by stained nuclei, was seen in the arcuate nucleus (Arc); anteroventral periventricular nucleus (AVPv); bed nucleus of the stria terminalis (BST); medial preoptic area (MPOA), and ventromedial hypothalamus (VMH), but not in control areas adjacent to the hypothalamus or cortex. Female opossums are induced into cytological, urogenital sinus (UGS), estrus by male pheromones and into behavioral estrus, i.