peptide and protein hormone metabolic pathway preproglucagon processing pathway 2015-07-14T08:47:05Z PW:0001759 The preproglucagon processing pathway gives rise to several peptide hormones in a tissue and cell specific manner. A subset, including glucagon, glucagon-like peptide-1 and peptide-2, and oxyntomodulin, are better characterized. The function of other preproglucagon derived peptides, remains to be established. pathway vpetri