14509
We conclude that there are prejunctional A1Rs in arteries and both pre - and postjunctional A1Rs in veins ; thus , adenosine selectively constricts the veins .
 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