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We show that both CREB isoforms are expressed in many cell types and mammalian species .
 protein: CREB; cell type: many cell types; protein: CREB isoforms
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: CREB; cell type: many cell types; protein: CREB isoforms