JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
STEM CELL, DRAWING Differentiation of human cells. Illustration of the differentiation of stem cells obtained from a blastocyst-stage embryo. Blastocyst stem cells are extracted and cultured on a bed of feeder cells. These cells differentiate spontaneously, some of them becoming neurons for the brain, others becoming muscle cells and bone and cartilage cells.
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