12301
CD2 cross-linking concurrently increased phosphorylation of CREB detected by immunoblot assay eightfold.
 protein: CD2; protein: CREB
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: CD2, CREB 
Answer:
 protein: CD2; protein: CREB