All structures placed in the canonical TCR-pMHC frame (PCA: z=MHC->TCR, y=peptide,
x=thin axis) with chains renamed A=Valpha B=Vbeta C=peptide D=MHCa E=MHCb/b2m. Native2026
is the comprehensive 2026 TCR:pMHC set (374 originals, peptide-preserving, geometry-
validated). The lossy renumbered Tcr3d2026 CIFs are removed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
