phosphoethanolamine + 3 S-adenosyl-L-methionine <=> phosphocholine + 3 S-adenosyl-L-homocysteine + 3 H(+)
phosphoethanolamine + 3 s-adenosyl-l-methionine <=> phosphocholine + 3 s-adenosyl-l-homocysteine + 3 h(+)