Blood Groups of the Mantled Howler Monkey (Alouatta palliata)

Abstract
Howler monkeys (52) were tested for their human-type A-B-O blood groups. All were group B, as shown by the presence of B and H in their saliva, and anti-A in serum. The B-like agglutinogen of their red cells is common to all New World monkey species tested, and is of different origin and significance than their true A-B-O blood group. Differences among the B-like agglutinogens of the red cells of howler monkeys, marmosets, rabbits and humans group B were demonstrated, and limited tests were also performed to study the biochemical basis of the anti-B reactions.

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