7159
BACKGROUND: Arsenic trioxide ( As2O3 ) can induce clinical remission in patients with acute promyelocytic leukemia via induction of differentiation and programmed cell death ( apoptosis ).
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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:
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