apoenzyme: a protein that combines with a coenzyme to form an active enzyme
protein: any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes
staphylococcal enterotoxin b: a form of staphylococcal enterotoxin that has been used as an incapacitating agent in biological warfare