CPN1 and retinal degeneration: In none of the known retinal degeneration Drosophila mutants [e.g., rdgA (Inoue et al., 1989), rdgB (Rubinstein et al., 1989), rdgC (Steele and O’Tousa, 1990), pp100 (Iakhine et al., 2004), and cpn (Weiss et al., 2012)] there is a similar pattern of degeneration.