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Yolk Flash and Prewave Pulse

Fig. 2A, B, and D

Imaging sequence from 95% epiboly to 12-somite stage

Imaging sequence spanning from late shield stage

Three waves propagating around the blastodisc margin

Fig. 3a, b, and c

A single bidirectional wave

A unidirectional wave arising from the left side

Ten tailbud pulses over 105 min at 8- to 12-somite stages

Prewave pulse and axial wave

A unidirectional wave arising from the left side