Confocal fluorescence images of maximum intensity projections of cortical actin (Utrophin-Venus) distribution in a representative oocyte during consecutive stages of CP morphogenesis. Asterisk demarcates the point of sperm entry. Arrows point at the transition zone between low- and high-intensity cortical actin domains. Arrowhead points at the vegetal bulge formed at the end of CP initiation. Dashed line demarcates the opening of the actin cortex at the AP upon fertilization. Scale bar, 30 m.
