405
Moreover, both the mutant nm23-H2His protein and truncated nm23-H2 protein containing N-terminal (1-60) peptide , which do not have NDP kinase activity , also inhibited erythroid differentiation of HEL cells .
 mutant nm23-H2His protein, N-terminal (1-60) peptide, NDP kinase, HEL cells, truncated nm23-H2 protein
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:
 mutant nm23-H2His protein, N-terminal (1-60) peptide, NDP kinase, HEL cells, truncated nm23-H2 protein