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In contrast to PU.1 , significant levels of Spi-B mRNA and protein are found only in some B-cell lines and spleen but are not found in myeloid cell lines , neutrophils , or macrophages .
 neutrophils, PU.1, Spi-B mRNA, macrophages, B-cell lines, Spi-B, myeloid cell lines
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:
 neutrophils, PU.1, Spi-B mRNA, macrophages, B-cell lines, Spi-B, myeloid cell lines