14044
All - trans retinoic acid ( atRA ) is the active form of vitamin A , known to activate retinoid receptors , especially the heterodimer retinoid X receptor ( RXR ) : retinoic acid receptor ( RAR ) that otherwise may play a role in regulation of some drug transporters .
 Chemical: All - trans retinoic acid; Chemical: atRA; Chemical: vitamin A; Chemical: retinoic acid
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: All - trans retinoic acid; Chemical: atRA; Chemical: vitamin A; Chemical: retinoic acid