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In order to determine whether NDP kinase expression serves as a marker for metastatic potential in human skin cancer , we assessed the levels of NDP kinase expression in 9 keratoacanthomas ( KAs ), 26 squamous cell carcinomas ( SCCs ), and 25 basal cell carcinomas ( BCCs ) using immunohistochemistry .
 ( protein: NDP kinase, None) , ( protein: NDP kinase, 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:
 ( protein: NDP kinase, None) , ( protein: NDP kinase, None) 