6473
Both insulin and cAMP - promoting agents activated beta - cat Ser675 phosphorylation , which was attenuated by IPA3 or protein kinase A inhibition , respectively .
 cAMP, Ser675
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cAMP, Ser675