1694
Cross-linking CD40 on B cells can lead to homotypic cell adhesion, IL-6 production , and, in combination with cytokines , to Ig isotype switching .
 protein: CD40; cell type: B cells; protein: cytokines; protein: IL-6
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: CD40, B cells, cytokines, IL-6 
Answer:
 protein: CD40; cell type: B cells; protein: cytokines; protein: IL-6