13041
Cellular retinol - binding protein , type I ( CrbpI ) , encoded by retinol - binding protein , type 1 ( Rbp1 ) , is a chaperone of vitamin A ( retinol ) that is epigenetically silenced in ~ 25 % of human breast cancers .
 Chemical: retinol; Chemical: retinol; Chemical: vitamin A; 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: retinol; Chemical: retinol; Chemical: vitamin A; Chemical: retinol