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A protein that forms the microfilaments of the eukaryotic cytoskeleton and plays an important role in cell movement, shape, and internal organization. In muscle cells, it functions with myosin to produce contraction.

[Latin āctus, motion; see act + -in.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) a protein that participates in many kinds of cell movement, including muscle contraction, during which it interacts with filaments of a second protein, myosin
[C20: from act + -in]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈæk tən)

a protein that functions in muscular contraction by combining with myosin. Compare actomyosin.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actin - one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form
actomyosin - a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions
simple protein - a protein that yields only amino acids when hydrolyzed
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
They'll get a good bit o' actin' out of it an' there's nothin' children likes as much as play actin'.
She was quite right, the comfortable wonderful mother creature--and she had never been more so than when she said their "play actin'" would be their joy.
See 'em now, actin' to be genewine moss-backs - every hair a rope- yarn an' blood Stockholm tar." He spoke down the cabin stairs.
Actins Limited, trading as Actins Limited, having ceased to trade having its registered office at 1 Vernon Grove, Rathgar, Dublin 6 and having its principal place of business at 1 Vernon Grove, Rathgar, Dublin 6 and has no assets exceeding [euro]150 and having no liabilities exceeding [euro]150, has resolved to notify the Registrar of Companies that the company is not carrying on business and to request the Registrar on that basis to exercise his/her powers pursuant to section 733 of the Companies Act 2014 to strike the name of the company off the register.
Recognizing that a single volume could never cover the breadth of recent research into the cytoskeleton, medical and biological researchers provide snapshots that capture the basic properties of each of the three major cytoskeletal systems: actins, intermediate filaments, and microtubules.
Images of confocal microscopy show that, in PEG 35 pretreated livers, filamentous actins (red) and hepatocytes morphology were better preserved when compared with nontreated ones.
The project leader Prof Inari Kursula said that the structures showed them that the two variants differ more from each other than actins in any other known living organism do and the high resolution enabled the researchers to identify areas within the proteins that cause the different behaviour.
4: Phylogenetic tree of fungal actins actin genes of Thermomyces lanuginosus and A.
Actins are highly conserved proteins that are part of the cytoskeleton.
The tumor cells are immunoreactive with actins and vimentin but not with CD34, CD31, or FVIII-RAg.
The contractile proteins actin and myosin, together with the structural proteins (e.g., titin and nebulin) and intermediate filaments, create a solid and efficient muscular architecture.