Fig. 11. (A,B) Two examples of Ca²⁺ oscillations of mature Cerebratulus sp. oocytes fertilized in ASW solution of SP600125. (A) Essentially normal oscillations that were characteristic of two out of four specimens showing repetitive Ca²⁺ elevations after fertilization (compare with Fig. 9 for normal oscillations in a control specimen). (B) Abnormal repetitive spiking that was characteristic of the other two oocytes displaying multiple fertilization-induced Ca²⁺ rises.