5418
The regulation of collagenase expression is cell-type specific; bacterial LPS and zymosan , a yeast cell wall derivative , are potent inducers of collagenase expression in macrophages , but do not alter fibroblast collagenase expression .
 ( cell type: fibroblast, None) , ( protein: collagenase, None) , ( protein: collagenase, None) , ( protein: collagenase, None) , ( cell type: macrophages, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: fibroblast, None) , ( protein: collagenase, None) , ( protein: collagenase, None) , ( protein: collagenase, None) , ( cell type: macrophages, None) 