A percentage of the population manifests the ABO blood group antigens in saliva and other mucous secretions and are thus referred to as "secretors," whereas those that do not are termed "nonsecretors." The difference between these 2 populations results from which of the following?
A) ABO antigens present on circulating lipids
B) ABO antigens present on circulating proteins
C) inappropriate activation of the ABO-specific glycosyltransferases in mucus-secreting tissues
D) mild hemolysis that releases cellular ABO antigens
E) presence of a mutant glycosyl hydrolase, which releases the ABO antigens from cell surfaces
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