Fig. 7

The tissue and cell morphology of mouse and zebrafish ovaries and mouse testes. a A section of mouse ovary stained with hematoxylin and eosin (HE). A follicle consisting of fully grown oocyte is shown. a, antrum; oc, oocyte cytoplasm; GV, germinal vesicle; fc, follicle cells. b-d Sections of zebrafish ovary stained with HE. Follicles consisting of stage I oocytes (b), stage II and III oocytes (c), and stage IV oocyte (d). GV, germinal vesicle; fc, follicle cells; Bb, Balbiani body; m, micropyle; oc, oocyte cytoplasm; c, chorion; y, yolk. e A transverse section of seminiferous tubules of mouse testis stained with HE. f An enlarged view of the boxed region marked in e. sg, spermatogonia; sc, spermatocytes; rsd, round spermatids; esd, elongating spermatids. Bars: 50 μm in A-E, 10 μm in F