RHO and retinal degeneration: The ATP induced model of retinal degeneration in the feline bypasses many of the limitations of comparable transgenic models such as the Abyssinian cat (Narfström and Nilsson, 1987; Kang Derwent et al., 2006) or rhodopsin transgenic pig (Petters et al., 1997; Li et al., 1998), as it is cheap, rapid, widely available and the injection protocol is relatively simple to perform.