She was only 12 days old when she made medical history.

On October 26, 1984, surgeon Leonard Bailey and his team at Loma Linda University Medical Center in California transplanted a baboon's heart into a newborn girl born with a fatal heart defect. The public knew her as "Baby Fae."

She lived for 21 days. The operation sparked fierce debate about medical ethics, consent and animal-to-human transplants. It also focused attention on infant heart transplantation, and Bailey's team later performed successful human-to-human heart transplants in babies.

Today, xenotransplantation research is back in the headlines. Where do you think medicine should draw the line?

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