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Biased usage of TRB variable genes in AITL and PTCL‐TFH. (A) Comparison of TRB variable gene usage between AITL/PTCL‐TFH and tonsillar TFH. (B) Comparison of CDR3 sequences among cases harbouring TRBV19 functional rearrangements. AITL031 and AITL036 have a nearly identical CDR3 sequence, suggesting possible recognition of a common antigen.
