15939
Spinal Muscular Atrophy ( SMA ) is due to the loss of the survival motor neuron gene 1 ( SMN1 ) , resulting in motor neuron ( MN ) degeneration , muscle atrophy and loss of motor function .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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