The structure, function and dynamic behavior of the cytoskeleton can be very different, depending on organism and cell type. Even within one cell the cytoskeleton can change through association with other proteins and the previous history of the network. A multitude of functions can be performed by the cytoskeleton.
The new Courage XT-6 (3.5 net HP) and Courage XT-7 (4.5 net HP) engines will be available on OEM push-mower brands in early 2008. The first two models from Kohler are engineered in the United States with high performance and ease of use in mind.
Kohler has the Command and Courage engines (and others but those are the main ones that show up in lawn mowers). Kohler is definitely not what it used to be. I have had problems with my Kohler Command 18 hp v-twin. It always ran hot and bent the push rods a few years ago.