Amino Acid Sequence|Binding Sites|Database Management Systems|Databases, Protein|Histocompatibility Antigens|Information Storage and Retrieval|Macromolecular Substances|Major Histocompatibility Complex|Molecular Sequence Data|Peptide Fragments|Peptides|Protein Binding|Protein Conformation|Sequence Alignment|Sequence Analysis, Protein|Structure-Activity Relationship|User-Computer Interface