sma spinal muscular atrophy, word genetic i sma, concept, a rare disease, a genetic defect in which the neurons in the spinal cord

sma disease spinal muscular atrophy medicine concept dna gene biology disorder genetic science medical chromosome neuromuscular structure research helix genes evolution biotechnology spiral code carcinogen molecule genome mutation infant biochemistry molecular treatment damage technology onset care smn microscopic neuron form areflexia vector werdnighoffmann health type word rare defect neurons cord responsible muscle contraction relaxation gradually die