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We have examined the influence of the affinity and concentration of exogenous peptide and the density of specific MHC molecules on the proliferation of a CD4+, DQA1*0501/DQB1*0201 (DQ2.1)-restricted, HSV-2 -specific T cell clone .
 cell line: CD4+, DQA1*0501/DQB1*0201 (DQ2.1)-restricted, HSV-2 -specific T cell clone; protein: MHC molecules
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: CD4+, DQA1*0501/DQB1*0201 (DQ2.1)-restricted, HSV-2 -specific T cell clone, MHC molecules 
Answer:
 cell line: CD4+, DQA1*0501/DQB1*0201 (DQ2.1)-restricted, HSV-2 -specific T cell clone; protein: MHC molecules