Although six genes encode this protein in humans, 
Although six genes encode this protein in humans, some plants have over sixty genes for it. This protein exhibits a phenomenon known as treadmilling, in which G monomers attach to the plus end and detach from the minus end of its F filament. The most abundant intracellular protein in eukaryotic cells, this protein is absent in the H zone of the sarcomere. For 10 points, name this protein that slides along myosin to produce muscle contraction.
Although six genes encode this protein in humans, some plants have over sixty genes for it.
actin