Fig. 1From: Human follicular fluid shows diverse metabolic profiles at different follicle developmental stagesDifferent sizes of follicles in one woman were selected. a Small follicles, with an average follicular diameter of 8–13 mm, corresponding to the FF volumes 0.3–1.0 ml. b Large follicles, with an average follicular diameter 17–22 mm, corresponding to the FF volumes 2.5–5 mlBack to article page