Ariadne Genomics Inc. retinal retinyl esters carotenoids carotenoids/beta-carotene re-esterifed retinol cell_retinol circ_retinol NADP+ NADPH all-trans-retinol retinyl esters ---> all-trans-retinol diet carotenoids ---> carotenoids/beta-carotene Scarb1 passive diffusion Lrat Bcmo1 Cd36 cell_retinol ---> circ_retinol Akr1b10 retinal ---> cell_retinol NADPH ---> NADP+ carotenoids/beta-carotene ---> retinal Plb1 Pnlip all-trans-retinol ---> cell_retinol cell_retinol ---> re-esterifed retinol Rbp2 cell_retinol ---- Rbp2 Abca1 Pnliprp2