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The increase in Cyp26a1 and Rar beta mRNA during pregnancy indicates increased retinoic acid signaling in the liver during pregnancy .
 Chemical: retinoic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: retinoic acid