title: Cyclic changes in the testis of the brook stickleback Eucalia inconstans (Kirtland).
mesh_terms: D000818:Animals; D005399:Fishes / Q000502:physiology*; D008297:Male; D008858:Microscopy, Phase-Contrast; D009929:Organ Size; D010507:Periodicity; D010587:Phagocytosis; D013094:Spermatozoa / Q000254:growth & development; D013737:Testis / Q000033:anatomy & histology / Q000502:physiology*; D014649:Vas Deferens / Q000033:anatomy & histology