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Retinaldehyde reduction can be performed by SDR and aldo - keto reductases ( AKR ) , while its oxidation to RA is carried out by aldehyde dehydrogenases ( ALDH ) .
 Retinaldehyde, aldehyde
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Retinaldehyde, aldehyde