Disadvantages:
Among other disadvantages, embryonic stem cells are highly unstable. They have not yet been through Mother Nature’s test, which is to create a human being. It is a well established fact that 50 to 75% of all human embryos fail to develop into a human being and spontaneously abort, due either to “inborn errors” such as a genetic mutation or to problems implanting. More pregnancies spontaneously abort than result in the successful birth of a child. Even considering the conservative estimate of 50% nonviability, when working in a laboratory with an embryo, it is impossible to know from which 50% any particular embryo has been selected. If embryonic stem cells happen to come from the 50% of embryos that would have proven to be nonviable (if allowed to develop normally), then those same “inborn errors” will be transferred to the patient receiving the stem cells. Clearly, this could cause more harm than good.
Disadvantages:Among other disadvantages, embryonic stem cells are highly unstable. They have not yet been through Mother Nature’s test, which is to create a human being. It is a well established fact that 50 to 75% of all human embryos fail to develop into a human being and spontaneously abort, due either to “inborn errors” such as a genetic mutation or to problems implanting. More pregnancies spontaneously abort than result in the successful birth of a child. Even considering the conservative estimate of 50% nonviability, when working in a laboratory with an embryo, it is impossible to know from which 50% any particular embryo has been selected. If embryonic stem cells happen to come from the 50% of embryos that would have proven to be nonviable (if allowed to develop normally), then those same “inborn errors” will be transferred to the patient receiving the stem cells. Clearly, this could cause more harm than good.
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