Glow in the Dark Sticker
Ruppy's name comes from a combination of "ruby" and "puppy" in reference to the red fluorescent protein (RFP) in her cells. This causes Ruppy to glow red, which is subtle yet noticeable in normal lighting. Transgenetic studies in dogs and other animals allow scientists to better understand disease in those animals as well as humans. Ruppy went on to have puppies of her own, which inherited her glow. The glow was most apparent in white or hairless areas, such as paw pads and nails.