Fig. 3.

PARR electropherogram showing poor amplification. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Size markers are shown in red. This sample has amplified poorly, generating a small number of low amplitude peaks using both primer sets 1 (blue) and 4 (green). The lack of a Gaussian distribution of fragments or a clonal peak suggests that only a small number of cells in the sample contained rearranged IgH genes. This sample was classified in the ‘no peak’ category, as the result suggests that either few lymphoid cells were present in the sample or that a clonal rearrangement was present but was not detected using these primers.