SMN, which stands for the English phrase survival of the neurons of motion is the name of a protein that in humans by the gene, SMN1 and SMN2 code.

This protein in the cytoplasm of the cells of the animal, and also the core, they can be found and unaffiliated regulate transcription, Genetic., the reconstruction of telomerase and transfer the active cell. Deficiency of this protein, which is often secondary to the mutated SMN1. lead to violations of a severe trimming Aran. specially in the motor neurons of the spinal cord can be one of the factors the incidence of spinal muscular atrophy.

research later showed that this protein in the movement of cells, neural, embryonic and differentiation, they also play a role.