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Agouti-signaling protein is a protein that in humans is encoded by the ASIP gene. [5] [6] It is responsible for the distribution of melanin pigment in mammals.[7] [8] Agouti interacts with the melanocortin 1 receptor to determine whether the melanocyte (pigment cell) produces phaeomelanin (a red to yellow pigment), or eumelanin (a brown to black pigment). [9]
The distribution of the pigment particles in the chromatophores can change under hormonal or neuronal control. For fishes it has been demonstrated that chromatophores may respond directly to environmental stimuli like visible light, UV-radiation, temperature, pH, chemicals, etc. [ 1 ] colour change helps individuals in becoming more or less ...
Black and tan a t causes a black back with a tan belly. A/a t heterozygotes look like A W mice. [4] Nonagouti a mice are almost completely black, with only a few yellow hairs around the ears and the genitals. [4] Extreme nonagouti a e mice are fully black, and is recessive to all other alleles in the series. [4] This is not a complete list of ...
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The house mouse (Mus musculus) ... In the wild they vary in color from grey and light brown to black (individual hairs are actually agouti coloured), ...
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Grullo or grulla, also called blue dun or mouse dun, is a smoky, blue-gray to mouse-brown color and can vary from light to dark. They consistently have black points and they often have a dark or black head. The primitive markings are usually all black. Genetically, the horse has an underlying black coat color, acted upon by the dun gene. [6] [7]