5238
An increase in Cyp26a1 mRNA ( 10 - fold ) and retinoic acid receptor ( Rar ) beta mRNA ( 2 . 8 - fold ) was also observed 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