KLAUS GULDBRANDSEN / SCIENCE PHOTO LIBRARY KLAUS GULDBRANDSEN / SCIENCE PHOTO LIBRARY
Stem cells incubation. Petri dishes of stem cells in an incubator. These are cultures of embryonic neuronal (nerve tissue) stem cells. Stem cells are precursor cells from which all the body's specialized tissues develop. Stem cell specialization can be initiated in the laboratory using chemical growth factors. Stem cell research involves trying to use stem cells to repair or replace diseased tissues or organs. All the cells in young embryos are stem cells, and these cells were obtained from embryos that had died of natural causes. Photographed at the Besta Neurological Institute, Milan, Italy.
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