The allele frequency net database is an online repository that contains information on the frequencies of immune genes and their corresponding alleles in different populations. At present, the system contains data on the frequency of genes from different polymorphic regions such as human leukocyte antigens, killer-cell immunoglobulin-like receptors, major histocompatibility complex Class I chain-related genes and a number of cytokine gene polymorphisms.
The SBT (Sequencing-based typing) interface is a tool accompanying the NCBI's Major Histocompatibility Complex database (dbMHC). It identifies the allelic composition of sequence-based typing (SBT) results of cDNA or genomic sequences. Samples are compared with databases containing all known alleles for several human leukocyte antigen (HLA) and killer cell immunoglobulin-like receptors (KIR) loci. An interactive sequence viewer allows inspection of the alignments.