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We have demonstrated that the level of CRE binding protein ( CREB ) was the same in all cell lines and that the putative AR-CRE forms specific and compatible protein interactions with CREB .
 protein: CREB; protein: AR-CRE; protein: CREB; protein: CRE binding protein
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: CREB, AR-CRE, CREB, CRE binding protein 
Answer:
 protein: CREB; protein: AR-CRE; protein: CREB; protein: CRE binding protein