Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
; Beijing Univ, Dept Cell Biol & Genet, Beijing 100871, Peoples R China
In order to explain the direction, speed and specificity of cell signaling a dual pathway hypothesis is proposed. In this hypothesis the physical pathway is coupled to the biochemical pathway. As an example, the propagation of a mechanical wave along the cytoskeleton components is discussed.