What is a Stem Cell? Research Ethical Issues Uses Pros Cons References Stem cells are usually very early stage cells which have the capacity to form into any specialised types of cells. Stem cell usually fall into one of three categories, these are; * Embryonic stem cells - These are unclassified stem cells which are derived from a human embryo. These stem cells are particularly useful and controversial. They are unclassified which means that can be …showed first 75 words of 1834 total…

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