{"term":{"id":"10888","title":"leucism","longtitle":"IUPAC Gold Book - leucism","doi":"10.1351\/goldbook.10888","code":"10888","status":"current","definitions":[{"id":1,"text":"Lack of pigmentation in the skin, hair, or feathers as a result of a failure of pigment cells to develop, or to migrate to those locations from their origin in the neural crest, in the embryo.","notes":{"1":"Unlike albinism, where the defect is in the production of melanin pigment only, animals with leucism usually have pigment in the eye, as retinal pigment cells do not derive from the neural crest."},"links":[{"term":"albinism","url":"https:\/\/goldbook.iupac.org\/terms\/view\/10354"},{"term":"neural crest","url":"https:\/\/goldbook.iupac.org\/terms\/view\/11001"},{"term":"retinal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/11179"}],"sources":["PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 772 (https:\/\/doi.org\/10.1515\/pac-2015-1202)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/10888\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/10888\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/10888\/plain"},"citation":"Citation: 'leucism' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.10888","license":"The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/) for individual terms.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2026-05-10T22:26:29+00:00"}}