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Fig. 1. Model developed to account for Ca2+ oscillations and waves in ascidian eggs. The red pathway shows experiments of gPtdIns(4,5)P2 (gPIP2) or Ins(1,4,5)P3 (IP3) flash photolysis, while the blue pathway shows the events supposed to occur at fertilization. The model is adapted from previous reports (Dupont and Swillens, 1996; Dupont and Erneux, 1997).