Yes, actin is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
actin
Noun
1. One of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form
What Scrabble words can I make with the letters in actin?
5 Letter Words
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3 Letter Words
2 Letter Words