13012
Down-regulation of 17beta-HSD IV mRNA expression was associated with enhanced estradiol inactivation by U937 cells , suggesting a link between estrogenic pathways and cell proliferation .
 ( cell line: U937 cells, None) , ( protein: 17beta-HSD IV, 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 line: U937 cells, None) , ( protein: 17beta-HSD IV, None) 