7233
This suggests that the conformational transition of the RALDH - retinal complex significantly contributes to the rate - limiting step that controls the kinetics of retinal oxidation , as a prerequisite for the formation of a catalytically competent Michaelis complex .
 Chemical: retinal; 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: retinal; Chemical: retinal