2004
The A ( 1 ) adenosine receptor ( A ( 1 ) AR ) was postulated to participate in the pathogenesis of hepatic fibrosis induced by experimental extrahepatic cholestasis ; however , the contribution of A ( 1 ) AR to intrahepatic cholestatic liver injury remains unknown .
 Chemical: adenosine
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: adenosine