1. Lutein and zeanthin and their potential roles in disease prevention;Ribaya-Mercado;J. Am. Coll. Nutr.,2004
2. Enrichment of eggs with lutein;Leeson;Poult. Sci.,2004
3. Modulation of humoral and cell-mediated immune responses by dietary lutein in cats;Kim;Vet. Immunol. Immunopathol.,2000
4. Dietary lutein stimulates immune response in the canine;Kim;Vet. Immunol. Immunopathol.,2000
5. Lohman LLS, Maple Leaf Hatcheries, Hamburg, ON; Merial Select, Merial Canada, Inc., Baie D'Urfe, QC; Fort Dodge Marek's disease vaccine, Wyeth, Madison, NJ; Intervet Canada Ltd., Whitby, ON.