Testes from rats flown on Cosmos 1887 were compared with vivarium control and synchronous control samples. The mean weights of flight testes, normalized for weight per 100 g, were 6.4% less when compared with the vivarium controls. Counts of spermatogonia from tissue sections (seminiferous tubules in maturation stage 6) from five animals in each group revealed 4% fewer spermatogonia in flight testes compared with synchronous controls and 11% fewer spermatogonia in flight samples compared with vivarium controls.— S app , W. J.; P hilpott , D. E.; W illiams , C. S.; K ato , K.; S tevenson , J.; V asquez , M.; and S erova , L. V. Effects of spaceflight on the spermatogonial population of rat seminiferous epithelium. FASEB J. 4: 101‐104; 1990.
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