zymosterol + S-adenosyl-L-methionine <=> fecosterol + S-adenosyl-L-homocysteine + H(+)
zymosterol + s-adenosyl-l-methionine <=> fecosterol + s-adenosyl-l-homocysteine + h(+)
zymosterol + S-adenosyl-L-methionine <=> fecosterol + S-adenosyl-L-homocysteine + H(+)
zymosterol + s-adenosyl-l-methionine <=> fecosterol + s-adenosyl-l-homocysteine + h(+)