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Amber (previously called X-Colour) is a yellow recessive coat colour observed in the Norwegian Forest Cat (NFC) population and apparently absent in other cat breeds.
Trait (Associated with Phenotype)
Base substitution G>A
It is a trait and so is tested based on preference, not usually for health concerns.
Mode of Inheritance:
Anim Genet. 2009 Aug;40(4):547-52. doi: 10.1111/j.1365-2052.2009.01864.x. Epub 2009 Apr 24
Associated Breed(s):Maine Coon, Norwegian Forest Cat,