S85-26569 (Feb 1985) --- Two prime crew payload specialists (PS) for NASA's Space Life Sciences-1 (STS-40) mission and a backup PS rehearse medical experiments in a JSC trainer. Left to right are Millie Hughes-Fulford, Robert Phillips and Drew Gaffney. Hughes-Fulford and Gaffney are scheduled to join five NASA astronauts for a Space Shuttle mission devoted to the study of life sciences.