7232
Use of the fluorescence resonance energy transfer upon retinol interaction with RALDHs provides evidence that retinal recognition occurs in two steps : binding into the substrate access channel , and a slower structural reorganization with a rate constant of the same magnitude as the kcat for retinal oxidation : 0 . 18 vs . 0 . 07 and 0 . 25 vs . 0 . 1 s ( - 1 ) for ALDH1A1 and ALDH1A2 , respectively .
 Chemical: retinol; 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: retinol; Chemical: retinal; Chemical: retinal