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The natural ligands for the RARs are ATRA and its stereoisomers 9 - cis - RA and 13 - cis - RA , whereas RXRs are activated by 9 - cis - RA only .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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