5JDS:
reference: Structural basis of a novel PD-L1 nanobody for immune checkpoint blockade., Zhang F, Wei H, Wang X, Bai Y, Wang P, Wu J, Jiang X, Wang Y, Cai H, Xu T, Zhou A, Cell Discov. 2017 Mar 7;3:17004. doi: 10.1038/celldisc.2017.4. eCollection 2017. PMID: 28280600

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