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Interestingly , the potentiating effect of histamine activation does not extend to other mGlu ( 4 ) - mediated signaling events downstream of G ( i / o ) G proteins , such as cAMP inhibition , suggesting that the presence of G ( q ) coupled receptors such as H ( 1 ) may bias normal mGlu ( 4 ) - mediated G ( i / o ) signaling events .
 Chemical: histamine; 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: histamine; Chemical: cAMP