7770
The relative contribution of each enzyme type in retinoid metabolism is discussed in terms of the different subcellular localization , topology of membrane - bound enzymes , kinetic constants , binding affinity of CRBP for retinol and retinaldehyde , and partition of retinoid pools between membranes and cytoplasm .
 retinoid, retinol, retinaldehyde, retinoid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 retinoid, retinol, retinaldehyde, retinoid