Fig. 5. Light micrograph of a recently ovulated follicle with corresponding extracellular H⁺ fluxes superimposed. The chorionated oocyte was loosely contained by the follicular epithelium, and fell away from the ovariole during dissection. H⁺ efflux in the region of the rim is still present after ovulation (asterisk), suggesting follicle cells generate this H⁺ flux. Red scale bar, 100 fmol cm^–2 s^–1; black scale bar, 100 µm.