The leukemia inhibitory factor- LIF is a kind of cell factor that has various living creature functions.It has the leukemia cell of inducement to divide, regulating the growth metabolism of the bone organization, maintaining the basic characteristic of the Embryonicstem celles and promoting the mankind build the blood stem cell to divide to propagate, promote the cholinergic neuron to divide, obstruct the fat cell to synthesize, stimulate the muscle cell growth, regulate the liver cell to expect to respond the egg white to synthesize etc. in the acute the biology activity etc. function.