12056
In vitro suppression of programmed cell death of B cells by tissue inhibitor of metalloproteinases-1 .
 B cells, metalloproteinases-1
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:
 B cells, metalloproteinases-1