14534
Since induction of the IL-2 receptor alpha subunit is a hallmark of lymphocyte activation , we suggest that p21ras naturally triggers B cell activation .
 cell type: B cell; protein: p21ras; protein: IL-2 receptor alpha subunit; cell type: lymphocyte
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: B cell, p21ras, IL-2 receptor alpha subunit, lymphocyte 
Answer:
 cell type: B cell; protein: p21ras; protein: IL-2 receptor alpha subunit; cell type: lymphocyte