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act of God
Act of Union
act on
act out
ACT-UP
act up
Actaeon
ACTH
actin
actin-
actinal
acting
actinian
actinic
actinide
actinism
actinium
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actin
ac·tin [ áktin ]


noun 
Definition:
 
protein involved in cell movement: a protein present in all cells and in muscle tissue where it plays a role in contraction
[Mid-20th century. < Latin actus (see act)]
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