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The last step of retinoic acid biosynthesis is irreversibly catalyzed by the NAD - dependent retinal dehydrogenases ( RALDH ) , which are members of the aldehyde dehydrogenase ( ALDH ) superfamily .
 Chemical: retinoic acid; Chemical: NAD; Chemical: retinal; Chemical: aldehyde
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: NAD; Chemical: retinal; Chemical: aldehyde