Figure 3 Monoclonal peaks superimposed on a polyclonal cell background. Electrophoretic profiles of PCR products of the T cell receptor γ chain gene using DNA from a T cell lymphoma. The profiles from frozen (grey line) and FFPE (black line) tissue are placed on top of each other showing identical patterns. (Vγ10 primer and a mixture of Jγ primers). The y axis indicates the relative fluorescence intensities and the x axis the size (bp) of the PCR products.