Now, one thing that kind of ties the resistance of skeletal muscle to cancer — to the cancer as a repair response gone out of control in the body — is that skeletal muscle has a factor in it called "" MyoD. "" And what MyoD essentially does is, it causes cells to differentiate into muscle cells. So this compound, MyoD, has been tested on a lot of different cell types and been shown to actually convert this variety of cell types into skeletal muscle cells.