Formation of AGE-amides in incubation mixtures of 200 mm glucose with 42 mmN1-t-Boc-lysine in 0.1 m phosphate buffer, pH 7.4, at 37 °C under aerated (closed symbols) and deaerated conditions (open symbols): N6-acetyl lysine (▴), N6-formyl lysine (♦), N6-lactoyl lysine (●), and N6-glycerinyl lysine (■).