When was this clue last seen?

This clue last appeared in the NYT Crossword on Tuesday, 21 September 2021.

Blood-typing system

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Keywords

typingsystemblood

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This clue appeared in the NYT Crossword on Tuesday, 21 September 2021. The answer ABO is a 3-letter entry.

What is the answer to "Blood-typing system"?: ABO
How many letters is the answer to "Blood-typing system"?: The answer has 3 letters.
When was this clue last seen?: This clue last appeared in the NYT Crossword crossword on Tuesday, 21 September 2021.
Has this crossword clue appeared before?: Yes. Variations of this clue have appeared 1 other time.

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