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countable and uncountable, plural actins
(biochemistry, uncountable) A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament). quotations examples
Actin has kidney-shaped polypeptide subunits, called globular actin or G actin, which bear the active sites to which the myosin heads attach during contraction.
2012, Elaine N. Marieb & Katja Hoehn, Human Anatomy & Physiology, 8th ed., chapter 9 "Muscles and Muscle Tissue", page 281.
(biochemistry, countable) One of the six isoforms of actin. examples