Salk Institute and Chinese researchers report creating a new kind of stem cell, one that is more versatile than any other normally grown in the lab. Called an extended pluripotent stem cell, it can give rise to every cell type in the body, the researchers say in a recent study. This includes the extra-embryonic tissues such as the placenta that support the developing baby. Just one cell can generate a complete organism. Embryonic stem cells and artificial embryonic stem cells called induced pluripotent stem cells cant make these extra-embryonic tissues. So neither embryonic nor IPS cells can give rise to a complete embryo, because the supportive tissues necessary for an embryo to survive arent there. But the extended pluripotent stem cells can reliably give rise to both types of cells, and thus whole embryos and offspring, the scientists report. The EPS cells were made from human and mouse embryonic stem cells. In addition, they were produced from skin cells, or fibroblasts by treating them with a chemical cocktail. IPS cells, invented in 2006, are generated from fibroblasts by a similar reprogramming process. Use of IPS cells is regarded as morally acceptable by those who oppose use of human embryonic stem … Continue reading
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