. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 284 H. SCHUEL when the oolemma that had initially depolarized to +20 mV is gradually repolarizing to the level (-70 mV) characteristic of the fertilized egg (Fig. 8). During normal fertilization in Arbacia elevation of the fertilization envelope (cortical reaction) is completed by 60 s after insemination, long before the rapid electrical (sodium de- pendent) block decays to 50% of its effectiveness at 90 s. Thus sea urchin eggs have adapted two typical cellular responses to stimulation, electrical depolarization of the plasm
GLIX-115-RHM54J
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 284 H. SCHUEL when the oolemma that had initially depolarized to +20 mV is gradually repolarizing to the level (-70 mV) characteristic of the fertilized egg (Fig. 8). During normal fertilization in Arbacia elevation of the fertilization envelope (cortical reaction) is completed by 60 s after insemination, long before the rapid electrical (sodium de- pendent) block decays to 50% of its effectiveness at 90 s. Thus sea urchin eggs have adapted two typical cellular responses to stimulation, electrical depolarization of the plasm