MHC class III genes encode
*HLA class III contains genes for
• Complement components C2 and C4 of classical pathway (Not C3)
• Properdin factor B of alternate pathway
• Tumor necrosis factor: Alpha and Beta
• Heat shock protein 70 
• Enzyme tyrosine hydroxylase
• Genes for MHC (also known as HLA) are located on short arm of chromosome 6.
Complement component C3
Interleukin 2
Tumor necrosis factor
Beta 2 microglobulin