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Therefore, we sought to determine whether MEK1 and ERK activities also stimulate IL-2 gene transcription .
 protein: ERK; DNA: IL-2 gene; protein: MEK1
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: ERK, IL-2 gene, MEK1 
Answer:
 protein: ERK; DNA: IL-2 gene; protein: MEK1