21201
Abstract Free fatty acid binding protein - 4 ( FABP4 ) and retinol binding protein - 4 ( RBP4 ) contribute to metabolic syndrome .
 Chemical: fatty acid; 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: fatty acid; Chemical: retinol