Fig. 10. (A,B) Essentially normal fertilization-induced Ca²⁺ response of Cerebratulus lacteus in 25 µM PD98059 (A) or 20 µM U0126 (B). (C) Three consecutive fertilization-induced Ca²⁺ waves (arrows) in PD98059-treated oocyte (images between waves have been deleted). Scale bar: 50 µm.