spinal muscular atrophy, sma, a genetic neuromuscular disorder

spinal muscular atrophy sma disorder code carcinogen genes spiral medicine technology helix 3d genetic genome biochemistry science concept biotechnology medical research dna molecular biology gene chromosome evolution structure mutation clone illustration microscopic molecule disease type 3 form kugelbergwelander juvenile onset areflexia neuromuscular smn 1 iii survival motor neuron