2404
These observations suggest that v-abl may be inhibiting the differentiation of B cells by blocking these two crucial elements in the maturation pathway .
 B cells, v-abl
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, v-abl