Crossword Genius

Muscle protein (5)

Ross

I believe the answer is:

actin

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">muscle protein</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

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

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