9788
CD40 ligation leads to B cell activation events such as proliferation , Ig secretion , isotype switching , and up-regulation of cell surface molecules , as well as the generation of memory B cells .
 protein: CD40; cell type: memory B cells; protein: cell surface molecules
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, memory B cells, cell surface molecules 
Answer:
 protein: CD40; cell type: memory B cells; protein: cell surface molecules