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Day 4: Setting Up Camp

The Egg Yolk

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Closeup of egg yolk At four days, nearly the entire body of the embryo has risen off the yolk and turned to lay on its left side. The upper portion of the embryo is even more curved and the tail is also beginning to curve. The heart is the dark red area within the upper curve of the embryo. Just a fraction of an inch from the heart, the eye is visible. The large node just above and to the right of the eye is a portion of the brain.



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EGG BIOLOGICAL IMAGING DATABASE EGG MATH EMBRYOLOGY NIH Image HOME Copyright (C) 1998 University of Illinois at Urbana-Champaign