UCH1, UCH2, UM-Chor1 and fibroblasts from a head and neck patient were analyzed for increased ALDH1 activity by the Aldefluor assay. When compared with a DEAB-inhibited control, UCH1, UCH2, UM-Chor1 registered ALDHhigh populations of .48%, .37%, and .17%, respectively. In contrasts, the fibroblasts measured an ALDHhigh population of 6.83%.