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We have utilized transient transfections , mutation analysis , electromobility gel - shifts , and immunoblot analysis to test the hypothesis that expression of the CTalpha gene is controlled in part by the binding of three trans - acting nuclear factors , Sp1 , Sp2 , and Sp3 .
 GENE: CTalpha gene; GENE: Sp1; GENE: Sp2; GENE: Sp3
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: CTalpha gene; GENE: Sp1; GENE: Sp2; GENE: Sp3