7808
Autoreactive B-cells are eliminated by anti-IgM crosslinking after encountering self-antigens , but precise mechanisms leading to B-cell apoptosis are still not well understood.
 cell type: Autoreactive B-cells; protein: self-antigens; cell type: B-cell; protein: anti-IgM
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: Autoreactive B-cells, self-antigens, B-cell, anti-IgM 
Answer:
 cell type: Autoreactive B-cells; protein: self-antigens; cell type: B-cell; protein: anti-IgM