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CONTENTS Introduction 246 How is the calcium wave triggered? 246 The calcium leak theory , 246 The sperm factor theory 249 Possible Involvement of a sperm receptor/G-proteln/PLC pathway in transduction of the sperm signal 251 The problem of identity of the sperm receptor 251 Involvement of Ins(1.4.5)P3 and Phosphol/paseC 25:1. Involvement of G-proteins during sperm signal transduction 252 Tyrosine kinase activities: a very early step of fertilization? ... 253 A model for the events occurring during the latent period 254 The propagation of the wave 255 Mechanisms of propagation 255 caz+ wave propagation In sea urchin eggs 255 ca2+wave propagation In Xenopus and hamster eggs 256 Refilling the calcium stores 257 Biological significance of fertilization waves 258 Summary and

Mechanisms of initiation and propagation of the calcium wave during fertilization in deuterostomes.