Crossword Genius

Muscle protein (5)

Ross

I believe the answer is:

actin

'muscle protein' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for actin that I've seen before include "What can affect muscles" , "protein" .)

I've seen this clue in the Penny Press, The New York Times, the L.A. Times Daily, the Universal and the Wall Street Journal.
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