5304
We identify A ( 2B ) as the primary receptor limiting mast cell degranulation , whereas the combined activity of A ( 2A ) and A ( 2B ) is required for the inhibition of cytokine synthesis .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None