11903
Such differentiation block by AML1a was canceled by the concomitant overexpression of AML1b .
 AML1a, AML1b
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:
 AML1a, AML1b