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