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Tumor necrosis factor alpha ( TNF-alpha ) mRNA production was analyzed by polymerase chain reaction amplification in monocytic U937 cells and in a chronically HIV infected U937 cell line ( U9-IIIB ).
 cell line: U9-IIIB; cell line: monocytic U937 cells; RNA: Tumor necrosis factor alpha ( TNF-alpha ) mRNA; cell line: chronically HIV infected U937 cell line; protein: Tumor necrosis factor alpha; protein: TNF-alpha
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cell line: U9-IIIB; cell line: monocytic U937 cells; RNA: Tumor necrosis factor alpha ( TNF-alpha ) mRNA; cell line: chronically HIV infected U937 cell line; protein: Tumor necrosis factor alpha; protein: TNF-alpha