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Melanocortin 1 Receptor (MC1R), also known as the Extension locus, is a gene that is responsible for producing pigments that are eumelanin (dark brown/black) or pheomelanin (reddish-yellow). There are seven known variants of this gene, with Eg being associated with the Grizzle coat.
MC1R
Dominant
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https://pubmed.ncbi.nlm.nih.gov/20525767/ https://doi.org/10.1111/age.13154 https://vgl.ucdavis.edu/test/mc1r-dog
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