preferred_name: an N-terminal L-alpha-aminoacyl-[protein] + 3 S-adenosyl-L-methionine => an N-terminal trimethyl-L-alpha-aminoacyl-[protein] + 3 S-adenosyl-L-homocysteine + 3 H(+)
preferred_name_lc: an n-terminal l-alpha-aminoacyl-[protein] + 3 s-adenosyl-l-methionine => an n-terminal trimethyl-l-alpha-aminoacyl-[protein] + 3 s-adenosyl-l-homocysteine + 3 h(+)
label: an N-terminal L-alpha-aminoacyl-[protein] + 3 S-adenosyl-L-methionine => an N-terminal trimethyl-L-alpha-aminoacyl-[protein] + 3 S-adenosyl-L-homocysteine + 3 H(+)
label_lc: an n-terminal l-alpha-aminoacyl-[protein] + 3 s-adenosyl-l-methionine => an n-terminal trimethyl-l-alpha-aminoacyl-[protein] + 3 s-adenosyl-l-homocysteine + 3 h(+)