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19.2 MB (4.7 MB compressed)
2598 x 2577 pixels
22.1 x 21.8 cm ⏐ 8.7 x 8.6 in (300dpi)
LENNART NILSSON, TT / SCIENCE PHOTO LIBRARY LENNART NILSSON, TT / SCIENCE PHOTO LIBRARY
Stem cells, coloured scanning electron micrograph (SEM). 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.
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