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Model for blastopore gating mechanism
(A-D) Model of blastopore gating mechanism. Actomyosin-dependent apical constriction at the dorsoventral end of the blastopore (light green) gives rise to a “pushing force” (red arrow) in the CBC, which maintains blastopore closure against the pressure in the archenteron (black arrow) (A, C). Relaxation of ventral contraction causes blastopore opening and fluid excretion due to a decrease in the upper limit of pressure resistance (B, D).
