Fig. 11. Light micrographs of an undifferentiated gonad (A) and early differentiating gonads from control eelpout embryos at day 0 (11 October) (B-G), showing transverse sections from the anterior end, central part and posterior end of the gonad. Scale bars, 100 µm. Paraffin section. Haematoxylin-eosin staining. (A) Undifferentiated gonad (20 September). (B-D) Early differentiating female gonad (B = anterior end; C = central part; D = posterior end). (E-G) Early two-lobed differentiating presumptive male gonad (E = anterior end; F = central part; G = posterior end). GC, germ cell; I, intestine; K, kidney; M, mesentery; OC, ovarian cavity; Og, oogonia.