710
PU.1 and Spi-B have been previously described as being predominantly expressed coordinately in macrophages and B cells , but their expression in early hematopoietic stages and during the course of myeloid differentiation to monocytes and macrophages or to neutrophils has not been extensively investigated.
 macrophages, macrophages, PU.1, monocytes, B cells, neutrophils, Spi-B
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:
 macrophages, macrophages, PU.1, monocytes, B cells, neutrophils, Spi-B