13417
Initial signaling through the CD4 receptor played a major role in the sensitization of HIV-infected T cells to undergo apoptosis .
 cell type: HIV-infected T cells; protein: CD4 receptor; 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-infected T cells, CD4 receptor, CD4 
Answer:
 cell type: HIV-infected T cells; protein: CD4 receptor; protein: CD4