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Recombinant caspase 6 ( Mch 2 ) primarily generates a 68-kDa cleavage product, as observed after calcium ionophore (CaI) induced B-cell apoptosis .
 Recombinant caspase 6, B-cell, Mch 2
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:
 Recombinant caspase 6, B-cell, Mch 2