GCG and diabetes mellitus: Some examples include Ziconotide, a peptide discovered in Conus magus, approved by U.S. Food and Drug Administration (FDA) for chronic pain treatment since 2004 [35]; and Exenatide, a synthetic form of a peptide found in the saliva of Heloderma suspectum that mimics the action of glucagon-like peptide-1, a new agent for type 2 diabetes mellitus treatment [36].