In this July 24, 2015, file photo, a sign at a Planned Parenthood Clinic is pictured in Oklahoma City. The furor on Capitol Hill over Planned Parenthood has stoked a debate about the use of tissue from aborted fetuses in medical research, but U.S. scientists have been using such cells for decades to develop vaccines and seek treatments for a host of ailments, from vision loss and neurological disorders to cancer and AIDS. (AP Photo/Sue Ogrocki/File)