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. 2022 Jun 8;16(2):281–288. doi: 10.1007/s12104-022-10092-5

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Fig. 4 — A ribbon representation of the backbone topology of PD-L1 (D1D2) (PDB: 3FN3), with the positions of residues with non-assigned backbone amide groups highlighted in yellow. The locations of proline residues are shown in blue