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Ubiquitin is typically conjugated to lysine residues on substrate proteins, most classically via K48 linkages, forming polyubiquitin chains that are recognized by the 26S proteasome

& Chapman, J

Gonzalez A, Salido GM (2016) Determination of reactive oxygen species production in pancreatic acinar cells

When you administer a peptide subcutaneously (into the layer of fat just under the skin), you completely bypass the formidable digestive gauntlet

The table gives you the data, but the real art is in the application

In preclinical work it up- and down-regulates a large number of genes tied to matrix production, remodeling, and antioxidant defense, and it ferries copper a cofactor for lysyl oxidase and superoxide dismutase into tissue