Actin Filaments consist of two strands of globular molecules, called actin (surprise right (^8 ) . The molecules are about 4 nm in diameter and they are twisted to form a helix. The distance of a complete turn of a strand is 13.5 molecules or about 36 nm.
Another interesting fact is that actin filaments are polar. Meaning
that one end different than the other. Also there are at least six
different types of actin synthesized in vertebrate cells.
Please send questions/comments/suggestions to: Mark
Dalton at markwdalton@gmail.com.