The antinuclear antibody (ANA) test is the go-to screening test for lupus. If the result is negative, says Dr. Gilkeson, you can almost guarantee that a patient doesnât have lupus. On the other hand, a positive result is much less clear; 90% to 95% of people who have a positive ANA test donât have lupus.
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Lutein is apparently employed by animals as an antioxidant and for blue light absorption. Lutein is found in egg yolks and animal fats. In addition to coloring yolks, lutein causes the yellow color of chicken skin and fat, and is used in chicken feed for this purpose.he functional difference between lutein (free form) and lutein esters is not entirely known. It is suggested that the bioavailability is lower for lutein esters, but much debate continues. As a food additive, lutein has the E number E161b (INS number 161b) and is extracted from the petals of marigold (Tagetes erecta).