PLCζ is the physiological trigger of the Ca(2+) oscillations that induce embryogenesis in mammals but offspring can be conceived in its absence by Hachem, A, Godwin, J, Ruas, M, Lee, H, Buitrago, M, Ardestani, G, Bassett, A, Fox, S, Navarrete, F, de Sutter, P, Heindryckx, B, Fissore, R, Parrington, J