SMN1, which is derived from the phrase "survival of the neurons in the Motor 1" and with the name, "GEMIN1" also known by the. name of a gene that in humans, the protein SMN's code does.

SMN1 version gene is that the protein SMN's code does. Version it. SMN2 is called. Both of this version, part of the upside down 500 the game on the long arm of chromosome 5, which are almost copies same gene has both, a type of protein code.

mutations in SMN1, the incidence of the disease spinal muscular atrophy in the relationship. however, mutations in the SMN2 alone, leads to this disease cannot be. If mutations simultaneously in both occurs the fetus before birth, dies.