The major histocompatibility complex (MHC) is a cluster of genes some of which are important in the immune response to infections. In sheep, this complex is referred to as the ovine leukocyte antigen (OLA) region. There are 2 major types of MHC class IIa molecules encoded by the OLA which are DR and DQ, each composed of an alpha and beta chain. The polymorphic epitope on ovine MHC class II DQ and DR molecules is constitutively expressed on antigen presenting cells such as dendritic cells, B lymphocytes, monocytes, macrophages, activated T lymphocytes and may be induced on a range of other cell types by interferon gamma.
HLA-D; HLA-DQ; HLA-DR; MHC Class 2; MHC class II; MHC HLA-D; MHC II HLA