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
Dusky-legged guan Dusky-legged guan The dusky-legged guan ("Penelope obscura") is a species of bird in the family Cracidae, the chachalacas, guans, and curassows. It is found in Uruguay, northeastern Argentina and southernmost areas of Paraguay and Brazil; a narrow disjunct range is in northern Argentina extending into south-central Bolivia. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. The bird measures an average of 73 centimeters in length and weighs an average of 1.2 kilograms, being very similar in appearance to its smaller relative, the rusty-margined guan ("P. supercilliaris"). It eats fruit, flowers and