“…For those that exist predominantly as homodimers, such as the cytosolic APXs from peas and soybean, pseudo first-order kinetics have been observed (33,34). In contrast, monomeric forms such as the peroxisomal APX from spinach and APXs from various unicellular algae obey Michaelis-Menten kinetics (35,36), which has led to the suggestion that the kinetics displayed by the homodimeric enzymes may be due to variation in the oligomeric form of the protein, especially when ascorbate concentrations are low (33).…”