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Thus, ceramide is not a positive signal for ERK activation in T-cell lines .
 cell line: T-cell lines; protein: ERK
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: T-cell lines, ERK 
Answer:
 cell line: T-cell lines; protein: ERK