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During 15 days of treatment of K562 cells with sodium phenylacetate , we observed an increase in the cellular hemoglobin concentration with a similar increase in the expression of gamma-globin mRNA .
 K562 cells, hemoglobin, gamma-globin 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:
 K562 cells, hemoglobin, gamma-globin mRNA