Fig. 1From: Glycation marker glucosepane increases with the progression of osteoarthritis and correlates with morphological and functional changes of cartilage in vivoProtein glycation, oxidation, and nitration free adducts, bone resorption marker hydroxyproline, and citrullinated protein. For glycation, oxidation, and nitration adduct residues of proteins, the NH3+- and -CO2− termini are part of the peptide backbone of the protein as -NH- and –CO- residues, respectivelyBack to article page