https://www.ncbi.nlm.nih.gov/Structure/pdb/3LN4
3LN4: Crystal structure of HLA-B*4103 in complex with a 16mer self-peptide derived from...
16-mer peptide from Heterogeneous nuclear ribonucleoproteins C1/C2Beta-2-microglobulinHLA class I histocompatibility antigen, B-41 alpha chainACETATE ION