The childhood disorder spinal muscular atrophy (SMA) is caused by reduced expression of the survival motor neuron (SMN) protein. SMN is a multifunctional protein that has been implicated in the production, processing and transport of RNA and ribonucleoproteins (RNPs). Within the nucleus, SMN is predominantly targeted to Cajal bodies (CB), which are involved in the maturation and processing of several subclasses of RNPs.
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