May be involved in mitogenic function of FGF1 (By similarity). May mediate with IER2 FGF-signaling in the establishment of laterality in the embryo (By similarity). Binds to internalized FGF1; this interaction is increased in the presence of CSNKB, suggesting a possible cooperative interaction between CSNKB and FIBP in binding to FGF1. Also associated with cytoplasmic membranes, particularly of mitochondria. Expressed throughout the development in embryo at 10.5 dpc. Expressed in the central nervous system at 12.5 dpc. Expressed in the ventral part of caudal diencephalon at 12.5 dpc. Expressed in the dorsal root ganglia at 12.5 dpc. Expressed in the kidney and lung at 12.5 dpc. Expressed in the dorsal and ventral midbrain at 18.5 dpc. Expressed uniformely in the cortex at 18.5 dpc.