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Decision time

发布时间:2019-03-07 07:09:05来源:未知点击:

By Rachel Nowak THE discovery two years ago of a technique for creating an immortal line of human embryonic stem cells (ESCs) raised hopes that it would one day be possible to grow endless supplies of specialised cells, or even organs for transplants. But researchers are still puzzling over the exact biochemical signals needed to control stem cells. A key step on that road has now been taken with a study of mouse ESCs, which shows that different levels of a “gatekeeper” protein called Oct-3/4 steer the cells towards becoming placenta,