IMGT/GENE-DB CONTENT As on July 2004, IMGT/GENE-DB contained 1375 genes and 2204 alleles from human and mouse (673 IG and TR genes and 1208 alleles from Homo sapiens, and 702 IG and TR genes and 996 alleles from mouse (most entries from Mus musculus, a few entries from Mus cookii, Mus minutoides, Mus pahari, Mus saxicola and Mus spretus) (Tables 1 and 2). This represents the complete set of human IG and TR genes, for all the seven loci (the three IG loci: IGH, IGK and IGL; and the four TR loci: TRA, TRB, TRG and TRD) and for the chromosomal orphon sets (6,7). The mouse entries are complete, except for the mouse IGHV group, which still has a provisional IMGT nomenclature but is near completion.