This movie starts after the first division of the fertilized zebrafish egg. The two cells are sitting on the top of the yolk which will serve as the embryos food for the first week of development. The cells divide many times and move down over the yolk. The movie finishes with the fishes body emerging from the ball of embryonic cells...the head and eye at one end and the tail at the other.

Credit:  Don Kane (U. Rochester)

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