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Follicle development shown by the diameter of each class of follicles in rats, beagles, and monkeys: primordial=primordial follicle, primary small=small primary follicle, primary large=large primary follicle, secondary=secondary follicle, preantral=preantral follicle, antral small=small antral follicle, antral large=large antral follicle, preovulatory=preovulatory follicle (selectable follicle), mature corpus luteum=mature (functional) corpus luteum.
