
Keywords: cNMPs; Nucleotidyl cyclases; Phosphodiesterases; Protein kinases; Bacterial toxins; Second messengers; AC; adenylyl cyclase; cAMP; adenosine 3â²,5â²-cyclic monophosphate; CC; cytidylyl cyclase; cCMP; cytidine 3â²,5â²-cyclic monophosphate; cGMP; guanos