5850
cDNA microarrays and a clustering algorithm were used to identify patterns of gene expression in human mammary epithelial cells growing in culture and in primary human breast tumors .
 ( cell type: human mammary epithelial cells, None) , ( DNA: cDNA microarrays, 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: human mammary epithelial cells, None) , ( DNA: cDNA microarrays, None) 