Actin

Definitions

1. A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
   uncountable
2. One of the six isoforms of actin.
   countable

Equivalents

Examples

“2012, Elaine N. Marieb & Katja Hoehn, Human Anatomy & Physiology, 8th ed., chapter 9 "Muscles and Muscle Tissue", page 281. 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.”

CEFR level