It's a story that makes your eyes well up: People willing to donate one of their own kidneys to complete strangers. The payoff is a quicker turnaround time on a transplant for someone the donor knows who needs a kidney but doesn't match their own.
The payoff is something deeper as well: A selfless act, a bond with someone in need, literally giving a living part of oneself so that another may live.
Nightline's moving segment, which aired nationally Thursday night, features donors, recipients and UAB's extraordinary program led by Dr. Jayme Locke.
Here's segment on ABC's Nightline: