Fig. 2From: Lysine supplementation is not effective for the prevention or treatment of feline herpesvirus 1 infection in cats: a systematic reviewMechanisms by which lysine may lower plasma and tissue arginine levels. The top part of the figure shows the mechanisms that may decrease arginine levels due to a reduction in the supply to the arginine pool, while the bottom part depicts the mechanisms that may lower arginine levels due to increased loss of the amino acid from the poolBack to article page