This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A protein found in muscle that together with myosin functions in muscle contraction.

n. A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).

n. One of the six isoforms of actin.

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

"Use of the term 'actin' like' doesn't mitigate the harm this crime has on survivors of sexual violence."

simple protein   

myosin    actinic   

actomyosin    isoactin   

Acton    acton    prolactin   

cytoskeletal    microtubule    vimentin    cytoskeleton    immunoglobulin    hairlike    nucleotide    haemagglutinin    contractile    alga