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Researchers distinguish two different types of blood stem cells

Red and white blood cells come from different sources

By Laura Sanders

- More than 2 years ago

All stem cells are not created equal, a new study finds. Two distinct kinds of self-renewing blood cells have been spotted in mice, muddying a simplistic view of stem cell categories.

NOT ALL EQUAL Human blood cells residing in bone marrow (one shown) may come in more than one kind and defy simplistic characterizations, a study in mice suggests.