October: Doctors transplant the heart of a baboon into a 12-day-old infant known as Baby Fae.

Baby Fae was born with hypoplastic left heart syndrome, a fatal underdevelopment of the heart's left pumping chamber.

Baby Fae survived 20 days after receiving her baboon heart.

By 1985, the year after Baby Fae got her heart, many doctors had concluded that animals and humans were simply too dissimilar for cross-species transplants to work.

"We wouldn't be where we are if it weren't for Baby Fae," he said in a recent interview.

The transplant appeared to be successful, but Baby Fae died 21 days later from a kidney infection.

"Baby Fae started a new era in heart transplantation" by applying to infants the skills learned in adults, he said.

Bailey did not look for a human heart for Baby Fae.

Unfortunately, Baby Fae died a few weeks later.

Baby Fae received cyclosporine, a standard anti-rejection drug that was not given to the man who received the baboon liver.