12853
Thirty percent of GC B cells , but not naive B cells , displayed mutations in the 742 bp region analyzed within the first intron of BCL-6 (overall frequency: 5 x 10(-4)/bp).
 cell type: GC B cells; cell type: naive B cells; protein: BCL-6; DNA: 742 bp region
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: GC B cells, naive B cells, BCL-6, 742 bp region 
Answer:
 cell type: GC B cells; cell type: naive B cells; protein: BCL-6; DNA: 742 bp region