sma rare disease abbreviation spinal muscular atrophy written on wooden blocks along with medical stethoscope, health concept,

sma genetic spinal muscular atrophy disease medicine dna illustration science concept structure disorder 3d biology medical gene research neuromuscular chromosome technology evolution carcinogen genes molecular genome helix mutation biochemistry biotechnology code molecule spiral damage clone onset areflexia infant microscopic smn type werdnighoffmann juvenile health nerve neuron