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shows what blood is, what happens when the immune system goes awry, what are stem cells are, and more. See videos exploring cell structure and function, cell development and motility, plankton, plants, and protozoa. Learn how the sea urchin helps us understand genes, reproduction, and cancer. (Exploratorium, Multiple Agencies)
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Stem cells are unspecialized cells that serve as the source, or "stem," for specialized cells like heart, brain, or blood cells. Found in days-old embryos and a few adult organs, stem cells have two unique properties: they can change into other types of cells, and theoretically, they can divide without limit. |
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Drosophila melanogaster |
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