7225
Retinoic acid biosynthesis catalyzed by retinal dehydrogenases relies on a rate - limiting conformational transition associated with substrate recognition .
 Chemical: Retinoic acid; Chemical: retinal
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; Chemical: retinal