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For example, for ABO, the A antigen was the very first to be discovered and has the number whereas the B antigen was next and is designated Collections. A collection contains antigens that are related in some way, e.g., by genetics or biochemistry, but they do not meet the criteria to form a blood group. Once a collection of antigens can be proven to be genetically distinct, they Location: Rockville Pike, Bethesda, MD.

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