Can exist in either a globular or a fibrous form

• Join the cast of, as a play
• Join the cast of
• Be part of, as a movie
• Be part of, as a film
• One of the proteins into which actomyosin can be split
• Words before self-defense
• Have a cast credit for

WordNet Word definitions in WordNet
n. one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form

Wikipedia Word definitions in Wikipedia
Actin is a family of globular multi-functional proteins that form microfilaments . It is found in essentially all eukaryotic cells (the only known exception being nematode sperm), where it may be present at concentrations of over 100 μM . An actin protein's ...