A detailed description and discussion of the events that follow is beyond the scope of this brief review. Suffice it to say that the exposure of the active site on actin allows the binding of the head of the myosin molecule with actin. ATP and the ATPase located in the myosin head, facilitate the detachment of myosin from actin (a cross-bridge formed in a previous contraction) and the formation of a new cross-bridge. The detailed structure of the myosin head was described for the first time in 1993 and contributed significantly to our understanding of the mechanics and physiology of this process. As mentioned above, the end-result of this sequence of events is the sliding of the actin and myosin filaments and the generation of force. Recent evidence suggests that this sequence of events within the cell is modulated by several genes including MTMR14, MG29, and KLF15.