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The FDA has issued guidance to stem cell facilities, recommending they adhere to specified basic safety standards and carry out clinical trials to ascertain the security and efficacy of their treatments.?? ?? ??? ??? ???? ? ??? ??? ??? ?? ???? ? ??. ???? ?? ?? ? ??? ??? ??? ??? ??? ??? ??? ???? ??? ??? ??.In multicellular organisms, stem cells are

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