Temperature-gradient gel of TCRγ PCR products. Lane 1-10, PCR products derived from blood and skin samples of SPP patients HO, ME, RI, SF, and SZ; all blood samples showed clonal PCR products. Lane 11, Hinc II digest of phi X174. S, skin sample; B, blood sample; M, marker (Hinc II digest of phi X 174); b, biallelic (or biclonal); m, monoclonal; p, polyclonal; ^a, range of polyclonal smears;^b, range of clonal bands.