major histocompatibility complex class III molecule

synonyms: class III MHC gene product, MHC class III molecule
https://doi.org/10.1351/goldbook.13433
Antigen encoded by the major histocompatibility complex (MHC) including several complement factors, tumor necrosis factor (TNF) $\ce{\upalpha\!}$, and lymphotoxin.
Note: The genes are found on the short arm of chromosome 6 between class I and class II genes, and although the gene products share no common function with the major histocompatibility complex (MHC) class I and MHC class II molecules, they are often discussed together.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1209 [Terms] [Paper]