Fig. 2.
Transfer of molecules between the oocyte and cumulus cells (modified from Gilchrist et al. 2004). BMP-6 – bone morphogenetic protein 6, cAMP – cyclic adenosine monophosphate, FF-MAS – follicular fluid meiosis-activating sterol, GDF-9 – growth-differentiation factor 9, GDF-9B – growth-differentiation factor 9B, BMP-15 – bone morphogenetic protein 15.