Subsequent to identification of FGF5 as causative for the angora mouse phenotype, genetic variants in FGF5 have been shown to underlie hair-length regulation in several other species, including cats ( Felis catus ) 7,8 , dogs ( Canis lupus familiaris ) 9,10 , donkeys ( Equus africanus asinus ) 11 , Syrian hamster ( Mesocricetus auratus ) 12 , domestic guinea pigs ( Cavia porcellus ) 13 , and even human ( Homo sapiens ) 14
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In fact, women on estrogen replacement may see a stronger GH response to the peptide protocol because estrogen enhances pituitary GH sensitivity, which means dosing may need to be adjusted accordingly