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
The Number of the Beast (novel) plays into the ideology of "Thou Art God" from Heinlein's earlier work "Stranger in a Strange Land". Jack Kirwan wrote in the "National Review" that the novel is "about two men and two women in a time machine safari through this and other universes. But describing "The Number of the Beast" thus is like saying "Moby Dick" is about a one-legged guy trying to catch a fish". He goes on to say that Heinlein celebrates the "competent person". Sue K. Hurwitz said in her review for the "School Library Journal" that it is "a catalog of Heinlein's sins as an