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