Blood-typing letters

This time we are looking on the crossword clue for: Blood-typing letters.
it’s A 20 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ABO.

Last seen on: –Wall Street Journal Crossword – September 16 2022 – Chit Chat
NY Times Crossword 28 Nov 21, Sunday
LA Times Crossword 8 Nov 21, Monday
NY Times Crossword 27 Apr 21, Tuesday
LA Times Crossword 18 Nov 20, Wednesday
The Washington Post Crossword – Jun 17 2020
LA Times Crossword 17 Jun 20, Wednesday
USA Today Crossword – Oct 25 2019
Wall Street Journal Crossword – September 28 2019 – Treasure Hunt
NY Times Crossword 9 Jun 19, Sunday
Universal Crossword – May 24 2019
The Washington Post Crossword – May 6 2019
LA Times Crossword 6 May 19, Monday