FABP4 and retinoblastoma: Therefore, here, we assessed the intraocular origin of FABP4 production in four representative intraocular tissue-derived cell types, including human non-pigmented ciliary epithelium (HNPCE) cells, retinoblastoma (RB) cells, adult human retinal pigment epithelial-19 (ARPE19) cells and human ocular choroidal fibroblast (HOCF) cells.