Ova! Can We Create Human Eggs in a Lab?

Eggs, at least the human kind, have always been a precious commodity. Women are born with all the eggs they will ever have in a lifetime, experts say — a biological handicap that helps explain why older mothers are more likely to miscarry and to bear children with birth defects: as women age, their dormant egg cells build up genetic mutations that make a healthy pregnancy less likely. But as it turns out, that thinking may be wrong, and infertility treatments may be the better for it.

Eight years ago, Jonathan...

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