Human placentas are full of mutated cells dumped by the embryo

THE human placenta is riddled with cancer-like patterns of mutations. But the discovery is better news than it might appear: it is helping scientists open a new window on the mysterious world of early human development. In some ways, the placenta is a forgotten organ. It begins to form shortly after fertilisation from the embryo’s cells and then helps to support the future fetus as it develops before it is discarded at birth. But … “I AM not just busy, I am being overwhelmed by an onslaught of requests like yours…” There is a certain irony to the email I have just received: the pioneer of burnout research is feeling utterly swamped by work. Christina Maslach, a psychologist at the University of California, Berkeley, spearheaded the study of burnout back…
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