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Human RXR alpha was significantly expressed in U937 and THP-1 cells , weakly expressed in H9 cells and not detectable in CEM cells .
 H9 cells, Human RXR alpha, CEM 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:
 H9 cells, Human RXR alpha, CEM cells