Fig. 5. Cx37 deficiency in granulosa cells does not impair oocyte-granulosa cell gap junctional coupling. 37^+/+oo/37^+/+gc follicles (A,B), 37^–/–oo/37^+/+gc follicles (C,D) and 37^+/+oo/37^–/–gc follicles (E,F) were microinjected with Lucifer Yellow for 10 minutes. Dye transfer from oocytes to granulosa cells was evident when both components were wild-type (B) and when the absence of Cx37 was restricted to the granulosa cells (F). Cx37-deficient oocytes did not pass dye to wild-type granulosa cells (D). Bar, 50 µm.