The silkworm Green b locus encodes a quercetin 5-O-glucosyltransferase that produces green cocoons with UV-shielding properties.
Daimon T, Hirayama C, Kanai M, Ruike Y, Meng Y, Kosegawa E, Nakamura M, Tsujimoto G, Katsuma S, Shimada T. Proc Natl Acad Sci U S A. 2010 Jun 22; 107(25):11471-6. Epub 2010 Jun 4.