serotonin + S-adenosyl-L-methionine => 5-methoxytryptamine + S-adenosyl-L-homocysteine + H(+)
serotonin + s-adenosyl-l-methionine => 5-methoxytryptamine + s-adenosyl-l-homocysteine + h(+)
serotonin + S-adenosyl-L-methionine => 5-methoxytryptamine + S-adenosyl-L-homocysteine + H(+)
serotonin + s-adenosyl-l-methionine => 5-methoxytryptamine + s-adenosyl-l-homocysteine + h(+)