27754
Adenosine receptor ( ARs ) and P2Y receptors ( P2YRs ) that respond to extracellular nucleosides / tides are associated with new directions for therapeutics .
 Adenosine, nucleosides / tides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Adenosine, nucleosides / tides