I did admit to being a little pedantic. But upon reflection, it's arguable that the paper would have been more interesting if they had included L-canavanine, i

I did admit to being a little pedantic. But upon reflection, it's arguable that the paper would have been more interesting if they had included L-canavanine, in addition to L-arginine and three analogs with shorter cationic side chains. Because we know that it can be incorporated during protein synthesis, in place of L-arginine. But none of their analogs can. So if L-canavanine had been incorporated into peptides in their tests, more or less as well as L-arginine, that would arguably have ruled out their hypothesis.