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Mammalian cells express two distinct forms of transcription factor CREB ( cAMP response element binding protein ) that are apparently the products of alternative splicing of the CREB gene transcript .
 RNA: CREB gene transcript; protein: transcription factor CREB; protein: cAMP response element binding protein; protein: CREB; protein: CREB; cell type: Mammalian cells
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:
 RNA: CREB gene transcript; protein: transcription factor CREB; protein: cAMP response element binding protein; protein: CREB; protein: CREB; cell type: Mammalian cells