the follicular components responsible for the synthesis of oestrogen , testosterone , and progesterone have been localized by studying in vitro the steroidogenic capacity of ( 1 ) intact follicles , ( 2 ) opened but undisturbed follicle walls , ( 3 ) isolated thecal shells , ( 4 ) granulosa cells and ( 5 ) co-cultures of thecal shells and granulosa monolayers .
C0018120
follicle
C0018207
granulosa cells