13527
In this study, various sets of somatic cell hybrids , generated by the fusion of epithelial cell lines with B-lymphoblastoid cell lines , were analyzed for the expression of major histocompatibility complex (MHC) class II antigens .
 protein: major histocompatibility complex (MHC) class II antigens; cell line: epithelial cell lines; cell line: somatic cell hybrids; cell line: B-lymphoblastoid cell lines
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: major histocompatibility complex (MHC) class II antigens, epithelial cell lines, somatic cell hybrids, B-lymphoblastoid cell lines 
Answer:
 protein: major histocompatibility complex (MHC) class II antigens; cell line: epithelial cell lines; cell line: somatic cell hybrids; cell line: B-lymphoblastoid cell lines