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Switching on\n                    <jats:italic toggle=\"yes\">Aldh1a2<\/jats:italic>\n                    or RA supplementation reactivated regeneration. Evolutionary inactivation of multiple\n                    <jats:italic toggle=\"yes\">Aldh1a2-linked<\/jats:italic>\n                    regulatory elements accounted for the deficient\n                    <jats:italic toggle=\"yes\">Aldh1a2<\/jats:italic>\n                    expression upon injury in mice and rats. Furthermore, the activation of\n                    <jats:italic toggle=\"yes\">Aldh1a2<\/jats:italic>\n                    by a single rabbit enhancer was sufficient to improve ear pinna regeneration in transgenic mice. 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