SPP1 and retinitis pigmentosa 1: Immunohistochemical staining (Fig. 5A, D, and G) and WB analysis (Fig. 5B, E, and H) showed significantly higher expression levels of CD44, OPN, and GRP94 in the RP group compared to the NRP group, which was supported by the quantification of WB (Fig. 5C, F, and I) and immunohistochemical staining (Fig. S7A to C).