histamine + S-adenosyl-L-methionine <=> N(tau)-methylhistamine + S-adenosyl-L-homocysteine + H(+)
histamine + s-adenosyl-l-methionine <=> n(tau)-methylhistamine + s-adenosyl-l-homocysteine + h(+)
histamine + S-adenosyl-L-methionine <=> N(tau)-methylhistamine + S-adenosyl-L-homocysteine + H(+)
histamine + s-adenosyl-l-methionine <=> n(tau)-methylhistamine + s-adenosyl-l-homocysteine + h(+)