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Using this RAR-selective antagonist , and RXR and RAR agonist , we demonstrate the RAR -mediated signaling pathway is important for differentiation and apoptosis of myeloid leukemic cells .
 RAR, RAR, myeloid leukemic cells, RXR
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:
 RAR, RAR, myeloid leukemic cells, RXR