8901
Previous studies have shown that binding to cell-surface heparan sulphate is essential for optimal activity of IFN-gamma and that free heparin competitively inhibits this sequestration process .
 protein: IFN-gamma
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: IFN-gamma 
Answer:
 protein: IFN-gamma