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HIV-1 -infected individuals have, on average, abnormally high levels of tumour necrosis factor alpha ( TNF alpha ) and abnormally low plasma cysteine levels .
 protein: tumour 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:
 protein: tumour necrosis factor alpha; protein: TNF alpha