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(+)