584
By virtue of the presence of CD4 on the cell surface , PLB-985 cells were chronically infected with HIV-1 strain IIIB .
 protein: CD4; cell line: PLB-985 cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: CD4; cell line: PLB-985 cells