2884
Human OATP1B1 and OATP1B3 are located on chromosome 12p12 in the OATP1 cluster ; both show predominant expression in the liver .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None