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Spinal and bulbar muscular atrophy ( SBMA ) is an inherited motor neuron disease caused by the expansion of a polyglutamine ( polyQ ) tract within the androgen receptor ( AR ) gene .
 Chemical: polyglutamine; Chemical: polyQ; Chemical: androgen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyglutamine; Chemical: polyQ; Chemical: androgen