Lipid-binding protein which promotes lipid absorption by facilitating MTTP-mediated lipid transfer (mainly triglycerides and phospholipids and MTTP-mediated apoB lipoprotein assembly and secretion (By similarity. Protects the gastrointestinal epithelium from irradiation-induced apoptosis (By similarity. May play an important role in maintaining normal growth homeostasis in epithelial cells. Involved in p53/TP53-dependent cell survival after DNA damage. May downregulate the expression of MAD1L1 and exert a suppressive role in mitotic spindle assembly checkpoint in hepatocellular carcinomas.