Development through hatching in the ascidian (sea-squirt) Corella inflata. The embryo is surrounded by a chorion and follicle cell layer which it co-habits with many test cells; the movie begins at the 2-cell stage and ends just after hatching. Note the behavior of the test cells toward the end of the movie. 360x time/water-immersion 25x/DIC (Kristin Sherrard & George von Dassow)

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