has_component has component has component develops from develops from has potential to develop into has potential to develop into primary ovarian follicle secondary ovarian follicle 2 pre-antral follicle preantral follicle ovary secondary follicle pre-ovulatory follicle folliculus ovaricus secondarius FMA:18637 MA:0002908 secondary egg follicle UBERON:0000036 secondary follicle of ovary antral follicle of ovary EMAPA:35632 A maturing ovarian follicle that has two more more layers of granulosa cells, up to the onset of antrum formation. secondary follicle tertiary ovarian follicle ovarian follicle granulosa cell layer