start stage end stage stromal cell theca cell zebrafish_anatomy A flattened stroma cell forming a sheath or theca outside the basal lamina lining the mature ovarian follicle. Thecal interstitial or stromal cells are steroidogenic, and produce primarily androgens which serve as precursors of estrogens in the granulosa cells. ZFA:0009229 TAO:0009229 CL:0000503 theca cells androgen secreting cell unknown adult