Article
Effects of a circadian mutation on seasonality in Syrian hamsters (Mesocricetus auratus).
Proceedings. Biological sciences - 22 Mar 1998
Loudon A S, Ihara N, Menaker M
Abstract excerpt
In Syrian hamsters, exposure to short photoperiods or constant darkness induces a decrease in gonadotrophin secretion and gonadal regression. After 10-12 weeks, animals undergo spontaneous gonadal reactivation, gonadotrophin concentrations rise, and in males, testes size increases and spermatogenesis resumes. The tau mutation shortens the period of circadian wheel-running activity by 4 h in the homozygote. Here,...
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