questin + S-adenosyl-L-homocysteine + H(+) => emodin + S-adenosyl-L-methionine
questin + s-adenosyl-l-homocysteine + h(+) => emodin + s-adenosyl-l-methionine
questin + S-adenosyl-L-homocysteine + H(+) => emodin + S-adenosyl-L-methionine
questin + s-adenosyl-l-homocysteine + h(+) => emodin + s-adenosyl-l-methionine