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In fact, NF-YA mRNA is present at the same level at all days of monocyte cultivation , whereas the protein is absent in freshly isolated monocytes but is progressively synthesized during the maturation process .
 freshly isolated monocytes, NF-YA, NF-YA mRNA
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:
 freshly isolated monocytes, NF-YA, NF-YA mRNA