Fundamental unit of 61-Down Crossword Clue

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The clue for your today's The Washington Post crossword puzzle is given below: "Fundamental unit of 61-Down" But, let's check out if we are able to find any clues for the The Washington Post puzzle.
With the options available, we will first collect all the information needed to get the right answer to our "Fundamental unit of 61-Down" clue for the crossword puzzle.
Only after that we will make a list of the various possible answers for the puzzle from the given Fundamental unit of 61-Down clue.

Best Answer: BASEPAIR
Crossword Date8 February 2017