The anterior hypothalamus of the brain participates in the regulation of male-typical sexual
behavior. The volumes of four cell groups in this region [interstitial nuclei of the anterior
hypothalamus (INAH) 1, 2, 3, and 4] were measured in postmortem tissue from three subject
groups: women, men who were presumed to be heterosexual, and homosexual men. No
differences were found between the groups in the volumes of INAH 1, 2, or 4. As has been
reported previously, INAH 3 was more than twice as large in the heterosexual men as in the�…

(�) 2 ()() 2 JSTOR http://www. jstor. Org/Te () ct 29 () 3: 52: 48, 2 ()() 2 growth, nuclear
segregation, DNA repair, and meiosis, and deletion of HRR25 results in cell cycle defects.
These phenotypes, coupled with the similarity of the HRR25 sequence to the sequence of
the Rafc-Mos protein kinase subgroup (Fig. 3A), suggest that HRR25 might play a similar
role in S. cerevisiae growth and development. The defects in DNA doublestrand break repair
and aberrant growth prop-erties revealed by mutations in the HRR25 kinase extend the�…