L-valine + L-arginine <=> N-amidino-L-valine + L-ornithine
l-valine + l-arginine <=> n-amidino-l-valine + l-ornithine
L-valine + L-arginine <=> N-amidino-L-valine + L-ornithine
l-valine + l-arginine <=> n-amidino-l-valine + l-ornithine