12855
These results indicate that the somatic hypermutation mechanism active in GC B cells physiologically targets non-Ig sequences .
 non-Ig sequences, GC B cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 non-Ig sequences, GC B cells