a protein in muscles
Origin of actinfrom Classical Latin actus (see act) + -in
actino-: used before a vowel: actinal
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.
Origin of actinLatin āctus motion ; see act. -in
Variant of actino-
(countable and uncountable, plural actins)
From Ancient Greek ἀκτίς (aktis, “ray”), based on the shape of the filament formed, and the English chemical suffix -in.