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However, no combination of CBF alpha and CBF beta subunits that we tested was able to distinguish the 1-bp difference in transcription assays .
 protein: CBF alpha; protein: CBF beta
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: CBF alpha, CBF beta 
Answer:
 protein: CBF alpha; protein: CBF beta