1647
Isolation of cDNA clones for 42 different Kruppel-related zinc finger proteins expressed in the human monoblast cell line U-937 .
 ( cell line: human monoblast cell line U-937, None) , ( protein: Kruppel-related zinc finger proteins, None) , ( DNA: cDNA clones, 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: human monoblast cell line U-937, None) , ( protein: Kruppel-related zinc finger proteins, None) , ( DNA: cDNA clones, None) 