2
Finally, using electrophoretic mobility shift assays , evidence was obtained that IL-4 inhibits LPS-induced expression of AP-1 protein.
 protein: AP-1; protein: IL-4
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:
 protein: AP-1; protein: IL-4