4355
In vitro, human B lymphocytes undergo long-term proliferation when activated through CD40 , a protein expressed on their cell surface.
 cell type: human B lymphocytes; protein: CD40
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: human B lymphocytes, CD40 
Answer:
 cell type: human B lymphocytes; protein: CD40