Unlike mammals, adult teleost fish and urodele amphibians can fully regenerate lost appendages. Understanding what initiates regeneration in these vertebrates is of great interest to the scientific community. Here, fin regenerates from a novel regeneration mutant were shown at 4 days post amputation.
Source: Chen et al., (2015). Transient laminin beta 1a induction defines the wound epidermis during zebrafish fin regeneration. PLoS Genet 11 (8), e1005437.