Blood-typing letters crossword clue

Hello crossword solvers! Today let's find the answer to the clue Blood-typing letters from the USA Today crossword. After we've gathered any other hints from the USA Today crossword puzzle and all possible helpful and relevant information from other sources, we are ready to solve the clue Blood-typing letters. The answer we found for the clue Blood-typing letters is:

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The answer has 3 letters: ABO

Last usage in USA Today crossword puzzle.