premise: In addition to the heart and aorta , successful measurements of <mask> and spleen have also been made by this technique .
hypothesis: the proper context for <mask> here should be large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes