1574
RNAase protection assays demonstrated that the MMP9 activity, unique to infected cells , is due to increased MMP9 mRNA levels .
 protein: MMP9; protein: MMP9; cell type: infected cells; protein: RNAase
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: MMP9, MMP9, infected cells, RNAase 
Answer:
 protein: MMP9; protein: MMP9; cell type: infected cells; protein: RNAase