follicles were isolated from hamster ovaries at 09:00 h and 15:00 h on each of the 4 days of the oestrous cycle ( day 1 = oestrus ; day 4 = pro-oestrus ) by microdissection and by a mixture of enzymes and classified into 10 stages with pre-calibrated pipettes ( stage 1 = preantral follicles with 1 layer of granulosa cells ; stage 10 = preovulatory antral follicles ) .
C0029939
ovaries
C0025329
oestrous cycle