Figure 1.

The basis of the immunosequencing assay. Multiple V, D and J gene segments exist in the germline genome. Initial receptor diversity is generated by recombination of V, D and J segments; and additional non‐templated diversity is introduced at the junctions by insertion of random nucleotides (N). The immunosequencing assay uses a multiplex PCR with forward primers for each V segment and reverse primers for each J segment. A simplified TCRB locus is shown as an example.