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The enzymes of retinol oxidation are NAD - dependent dehydrogenases of the cytosolic medium - chain ( MDR ) and the membrane - bound short - chain ( SDR ) dehydrogenases / reductases .
 retinol, NAD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 retinol, NAD