2996
Interferon-gamma ( IFN-gamma ) is produced by natural killer cells and certain subsets of T cells , but the basis for its selective expression is unknown.
 protein: Interferon-gamma; cell type: natural killer cells; cell type: T cells; 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: Interferon-gamma, natural killer cells, T cells, IFN-gamma 
Answer:
 protein: Interferon-gamma; cell type: natural killer cells; cell type: T cells; protein: IFN-gamma