preferred_name: an N-terminal L-alpha-aminoacyl-[protein] + L-arginine => an N-terminal L-arginyl-L-aminoacyl-[protein] + H2O
preferred_name_lc: an n-terminal l-alpha-aminoacyl-[protein] + l-arginine => an n-terminal l-arginyl-l-aminoacyl-[protein] + h2o
label: an N-terminal L-alpha-aminoacyl-[protein] + L-arginine => an N-terminal L-arginyl-L-aminoacyl-[protein] + H2O
label_lc: an n-terminal l-alpha-aminoacyl-[protein] + l-arginine => an n-terminal l-arginyl-l-aminoacyl-[protein] + h2o