English: Rendering of PDB:1IM9, the HLA-Cw4 molecule with bound Peptide (KILLER CELL IMMUNOGLOBULIN-LIKE RECEPTOR 2DL1 Not shown for clarity reasons]. Beta-2 microglobulin (rose), HLA-A (alpha) *0401 (cyan) and peptide (yellow). This image is from: Crystal structure of the human natural killer cell inhibitory receptor KIR2DL1 bound to its MHC ligand HLA-Cw4 as part of the published work Fan, Q.R., Long, E.O., Wiley, D.C. (2001) Crystal structure of the human natural killer cell inhibitory receptor KIR2DL1-HLA-Cw4 complex. Nat.Immunol. 2: 452-460. The structure was rendered with PDB Protein workshop 1.5 and arranged with MS Paint.