Heterophile antigens are antigens of similar nature, if not identical, that are present in different tissues in different biological species, classes, or kingdoms.
Other heterophile antigens are responsible for some diagnostic serological tests such as: Chemically, heterophile antigens are composed of lipoprotein-polysaccharide complexes.
There is a possibility of there being identical chemical groupings in the structure of mucopolysaccharids and lipids.
It is widely present in some plants bacteria animal and birds.
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