label: L-cysteinyl-[protein] + S-adenosyl-L-methionine <=> S-methyl-L-cysteinyl-[protein] + S-adenosyl-L-homocysteine + H(+)
label_lc: l-cysteinyl-[protein] + s-adenosyl-l-methionine <=> s-methyl-l-cysteinyl-[protein] + s-adenosyl-l-homocysteine + h(+)