1222
This protein had an apparent molecular mass of 84 kDa and was not recognized by stat3 or stat1 mAb or antisera .
 stat1 mAb, 84 kDa, stat3
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:
 stat1 mAb, 84 kDa, stat3