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This results in low survival motor neuron protein levels, which are not enough to sustain motor neurons. SMN disruption has been undertaken in different organisms (yeast, nematode, fly, zebrafish, and mouse) in an attempt to model this disease and gain fundamental knowledge about the survival motor neuron protein. This review compares the various animal models generated to date and summarizes a research picture that reveals a pleiotropic role for survival motor neuron protein; this summary also points to unique requirements for survival motor neuron protein in motor neurons. 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