HLA A1-B8 (Also:HL A1,8; HL A1,A8; HLA A1-Cw7-B8; HLA A*01-B*08, HLA A*0101-B*0801, HLA A*0101-Cw*0701-B*0801; HLA A*01:01-C*07:01-B*08:01) is a multigene haplotype that covers the MHC Class I region of the human major histocompatibility complex on chromosome 6. A multigene haplotype is set of inherited alleles covering several genes, or gene-alleles; common multigene haplotypes are generally the result of identity by descent from a common ancestor (share a recent common ancestor for that segment of the chromosome). Chromosomal recombination fragments multigene haplotypes as the distance to that ancestor increases in number of generations.