13418
Incubation of HIV-infected cells with monoclonal antibody (MAb) 13B8-2 , which binds to CD4 in a region critical for dimerization of the receptor, prevented apoptosis without inhibiting HIV replication .
 protein: monoclonal antibody (MAb) 13B8-2; cell type: HIV-infected cells; 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: monoclonal antibody (MAb) 13B8-2, HIV-infected cells, CD4 
Answer:
 protein: monoclonal antibody (MAb) 13B8-2; cell type: HIV-infected cells; protein: CD4