label: an N-terminal L-alpha-aminoacyl-[protein] + L-arginyl-tRNA(Arg) = an N-terminal L-arginyl-L-aminoacyl-[protein] + tRNA(Arg) + H(+)
label_lc: an n-terminal l-alpha-aminoacyl-[protein] + l-arginyl-trna(arg) = an n-terminal l-arginyl-l-aminoacyl-[protein] + trna(arg) + h(+)