Recombinant MA2 IgG1 bound to MART1 peptide-pulsed A375 human melanoma cell lines (Extended Data Fig. 6a) and bound to single-chain MART1 (A2L)/HLA-A2 pMHC was displayed on 293 cells with negligible background (Extended Data Fig. 6b). Here, PNMA2 is linked to melanoma.