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| - Main article: Psychological aspects of blood The ABO blood
group system is the most important blood type system (or blood
group system) in human blood transfusion. The associated anti-A
antibodies and anti-B antibodies are usually IgM antibodies,
which are usually produced in the first years of life by
sensitization to environmental substances such as food, bacteria
and viruses. ABO blood types are also present in some animals,
for example apes such as chimpanzees, bonobos and gorillas. The
A antigen and the B antigen are derived from a common precursor
known as the H antigen (or H substance). The H antigen is a
glycosphingolipid (sphingolipid with carbohydrates linked to the
ceramide moiety). Since it lacks N-acetylneuraminic acid (sialic
acid) it is referred to as a globoside, not a ganglioside. In
blood group O the H antigen remains unchanged and consists of a
chain of galactose,