label: cycloartenol + S-adenosyl-L-methionine = 24-methylenecycloartanol + S-adenosyl-L-homocysteine + H(+)
label_lc: cycloartenol + s-adenosyl-l-methionine = 24-methylenecycloartanol + s-adenosyl-l-homocysteine + h(+)