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30.7 x 40.9 cm ⏐ 12.1 x 16.1 in (300dpi)
GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Culturing stem cells. Illustration of stem cells being cultured in a petri dish. Stem cells are undifferentiated cells that can produce other types of cell when they divide. There are three main stem cell types in mammals: embryonic stem cells, derived from blastocysts; adult stem cells, which are found in adult tissues; and cord blood stem cells, which are found in the umbilical cord. A microscope view of the stem cells is at top.
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