Crystal Structures of Two Closely Related but Antigenically Distinct HLA-A2/Melanocyte-Melanoma Tumor-Antigen Peptide Complexes Piotr Sliz, Olivier Michielin, Jean-Charles Cerottini, Immanuel Luescher, Pedro Romero, Martin Karplus, and Don C. Wiley J Immunol 2001 167:3276-3284; doi:10.4049/jimmunol.167.6.3276