FABP4 and retinitis pigmentosa: Since there were still limited information on the extent of the involvement of FABP4 in RVD etiology and several unsolved questions, including the origin of the intraocular FABP4 despite no fatty tissues being intraocularly present, we have assessed the expression sites of the FABP family in the intraocular tissues in human retinas, wild-type (WT) rat and mouse retinas and in those in DR and retinitis pigmentosa (RP) models by immunolabeling.