hercynine + 3 S-adenosyl-L-homocysteine + 3 H(+) => L-histidine + 3 S-adenosyl-L-methionine
hercynine + 3 s-adenosyl-l-homocysteine + 3 h(+) => l-histidine + 3 s-adenosyl-l-methionine
hercynine + 3 S-adenosyl-L-homocysteine + 3 H(+) => L-histidine + 3 S-adenosyl-L-methionine
hercynine + 3 s-adenosyl-l-homocysteine + 3 h(+) => l-histidine + 3 s-adenosyl-l-methionine