Contact: Zach Veilleux
Caption: Forty-two hours after they began to differentiate, embryonic cells are clearly segregating into endoderm (red), mesoderm (blue) and ectoderm (black). Researchers say the key to achieving this patterning in culture is confining the colonies geometrically.
Credit: Brivanlou Lab, The Rockefeller University
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Related news release: Using geometry, researchers coax human embryonic stem cells to organize themselves