Cover: Overlay image of a radial cryosection of bovine retinae co-immunostained with antibodies against the retinitis pigmentosa GTPase regulator (RPGR; green) and retinitis pigmentosa GTPase regulator-interacting protein 1 (RPGRIP1; red) isoforms. RPGR and RPGRIP1 colocalized at restricted foci throughout the outer segment subcellular compartment of photoreceptor cells (yellow). See Article by Mavlyutov et al., in this issue, pp.1899-1907.
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