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To address this question, we took advantage of a panel of CD8+ T cell clones from the joint of a rheumatoid arthritis patient and selected for their reactivity against a single MHC/peptide complex .
 cell line: CD8+ T cell clones; protein: single MHC/peptide complex
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: CD8+ T cell clones, single MHC/peptide complex 
Answer:
 cell line: CD8+ T cell clones; protein: single MHC/peptide complex