Temperature gradient gel of mixed corresponding clonal TCRγ PCR products. S, skin sample; B, blood sample; X, mixture of blood and skin sample (1:1). Patients Hö, He, Ma, and Zw show identical patterns in all 3 lanes; patients Le and Ot have different patterns, whereby lane X appears as summation of B and S. a, range of polyclonal smears; b, range of clonal bands.