4058
The Ets protein Spi-B is expressed exclusively in B cells and T cells during development.
 B cells, Spi-B, T cells
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, Spi-B, T cells