PITPNM1 and retinitis pigmentosa 1: Altogether, observed changes occurring in rd9 retinas recapitulate very early stages of degeneration in other mouse models of RP and in RP patients (Strettoi and Pignatelli, 2000; Strettoi et al., 2002, 2003; Marc et al., 2003; Pignatelli et al., 2004; Gargini et al., 2007; Strettoi, 2015; Jones et al., 2016).