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From supershift experiments it was concluded that one DNA-binding complex contained Stat1 alpha , probably as a homodimer.
 protein: DNA-binding complex; protein: Stat1 alpha
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: DNA-binding complex, Stat1 alpha 
Answer:
 protein: DNA-binding complex; protein: Stat1 alpha