2637
Role of HIV-1 Nef expression in activation pathways in CD4 + T cells.
 protein: HIV-1 Nef; protein: CD4
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: HIV-1 Nef, CD4 
Answer:
 protein: HIV-1 Nef; protein: CD4