HLA-C and melanoma: IPD currently consists of five databases: IMGT/HLA, which contains sequences of the human Major Histocompatibility Complex (MHC); IPD-KIR, which contains the allelic sequences of the human Killer-cell Immunoglobulin-like Receptors; IPD-MHC, which is a database of sequences of the MHC of different species; IPD-HPA, which is a database of human platelet antigens; and IPD-ESTDAB, which provides access to the European Searchable Tumour Cell-Line Database, a cell bank of immunologically characterized melanoma cell lines.