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The presumed cellular mechanism of action involves the generation of intracellular cAMP , which in turn can activate the effector molecules cAMP - dependent protein kinase ( PKA ) and Epac .
 Chemical: cAMP; Chemical: cAMP
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: cAMP; Chemical: cAMP