484
Class II antigen expressing T-cell lines maintained contacts identical to B-cell lines , while class II-negative T-cell lines exhibited no interactions.
 cell line: B-cell lines; cell line: class II-negative T-cell lines; cell line: Class II antigen expressing T-cell lines
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:
 cell line: B-cell lines; cell line: class II-negative T-cell lines; cell line: Class II antigen expressing T-cell lines