... levels; furthermore, neither androgens in males nor estrogen in females increased cell proliferation in the preoptic area (POA) and infundibular hypothalamus, brain regions involved in endocrine regulation and acoustic communication. In fact, elevated estrogen levels decreased cell proliferation in those...

... of aromatase (cyp19) while increasing mRNA levels of androgen and estrogen receptors. These results are similar to previous research in R. pipiens but differ from data for S. tropicalis, for which we found an increase in androgen synthesis enzymes but no effect on cyp19. Together, we propose that T3 has...

..., instructions or products referred to in the content or advertisements. Bird song Sexual dimorphism Estrogen Androgen Brain Behav. Evol. 28: 22-31 (1986) Sexual Dimorphisms in the Neural Vocal Control System in Song Birds: Ontogeny and Phylogeny Arthur P. Arnolda, Sarah W. BottjerA, Eliot...

... the mechanisms of sexual differentiation in mammals, and then apply the same experimental analysis to the study of sexual differentiation of the neural song circuit in the zebra finch (Poephila guttata), a passerine song bird. Administration of estrogen to young female zebra finches causes the female to develop...

... as Model Systems for Studying Long-Term Steroid Action on Neural Circuits Key Words Electric organ discharge Testosterone Estrogen Na * current Abstract Weakly electric fish generate electric organ discharges (EODs) that are speciesspecific and often sexually-dimorphic. The waveform or frequency of an EOD...

...Colin J. Saldanha; J. Douglas Schultz; Sarah E. London; Barney A. Schlinger In oscine passerines, the telencephalon expresses high levels of the estrogen synthetic enzyme aromatase. In contrast, forebrain aromatase is limited to low levels at discrete limbic loci in non-passerines. The function...

... responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Steroid hormones Non-genomic Membrane receptors Behavior Corticosterone Progesterone Estrogen Androgen Amphibian Mammal Until...

... response has been established, one can use the localization of steroid hormone receptors in the brain to facilitate the identification of neural circuits that control behavior. The recent identification of a second type of estrogen receptor called estrogen receptor β or ERβ has raised new issues about...

...) in both species [Dunlap et al., 1998]. Female brown ghosts have higher levels of estrogen (E 2 ) than males; E 2 has not been measured in black ghosts. In keeping with the lower EOD frequency of female brown ghosts, E 2 treatment lowers EOD frequency of gonadally-intact or gonadectomized fish...