13042
CrbpI delivers vitamin A to enzymes for metabolism into an active metabolite , all - trans retinoic acid ( atRA ) , where atRA is essential to cell proliferation , apoptosis , differentiation , and migration .
 Chemical: vitamin A; Chemical: all - trans retinoic acid; Chemical: atRA; Chemical: atRA
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: vitamin A; Chemical: all - trans retinoic acid; Chemical: atRA; Chemical: atRA