Blood type letters

This time we are looking on the crossword clue for: Blood type letters.
it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ABO.

Last seen on: –LA Times Crossword 10 Jan 22, Monday
Universal Crossword – Oct 22 2020
LA Times Crossword 6 Dec 18, Thursday
The Washington Post Crossword – Dec 6 2018