label: Spinal Muscular Atrophy Type 2
label_lc: spinal muscular atrophy type 2
description: "An autosomal recessive condition caused by mutation(s) in the SMN1 gene, encoding survival motor neuron protein. It is characterized by onset between 3 and 15 months of age, and is intermediate in terms of severity between spinal muscular atrophy (SMA) type I and SMA type III."