7230
This study addresses the molecular basis of retinal recognition in human ALDH1A1 ( or RALDH1 ) and rat ALDH1A2 ( or RALDH2 ) , through the comparison of the catalytic behavior of retinal analogs and use of the fluorescence properties of retinol .
 Chemical: retinal; Chemical: retinal; Chemical: retinol
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; Chemical: retinol