IVF Testing Spurs a Debate Over ‘Mosaic’ Embryos

Some women hoping to get pregnant—and the doctors treating them—agonize over using embryos with some abnormal cells

It was her last chance.

MaryJo Dunn had been trying to get pregnant through in-vitro fertilization for 20 months.

At age 45, she expected it to be challenging. But giving up wasn’t easy. She and her husband had lost their only child, a 17-month-old son, two years earlier to a rare type of cancer.

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