to investigate whether or not sulfite oxidase activity ( ec 1.8.3.1 ) is regulated by the amount of sulfur from dietary protein or excess methionine , we fed rats diets containing 5 , 10 , 20 and 50 % casein with or without excess methionine and measured sulfite oxidase activity in liver and intestinal mucosa .
C0012177
dietary protein
C0007332
casein