Zebrafish their larval stages. In 2011, the British Heart Foundation ran an advertising campaign publicising its intention to study the applicability of this ability to humans, stating that it aimed to raise £50 million in research funding. Zebrafish have also been found to regenerate photoreceptor cells and retinal neurons following injury, which has been shown to be mediated by the dedifferentiation and proliferation of Müller glia. Researchers frequently amputate the dorsal and ventral tail fins and analyze their regrowth to test for mutations. It has been found that histone demethylation occurs at the site of the amputation, switching the zebrafish's cells
Blue-legged mantella Blue-legged mantella The blue-legged mantella (Mantella expectata) is a species of frog in the family Mantellidae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical dry forests, rivers, and intermittent rivers. It is threatened by habitat loss. It is over collected for the pet trade and may soon qualify for critically endangered again. The blue-legged mantella has a peculiar appearance with a distinctive yellow back, contrasted by bluish legs, and a black underside. Sex can be determined by the size of the body (females being noticeably larger than males), a horseshoe-shaped blue spot located on the lower