14687
In summary, our data suggest that changes in the composition of transcription factor AP-1 is a key molecular mechanism for increasing IL-2 transcription and may underlie the phenomenon of costimulation by EC .
 cell type: EC; protein: AP-1; protein: transcription factor; protein: IL-2
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: EC, AP-1, transcription factor, IL-2 
Answer:
 cell type: EC; protein: AP-1; protein: transcription factor; protein: IL-2