... retinoid binding, and x-ray analysis of a human retinol -binding protein. Proc Natl Acad Sci USA 98, 3710–3715.5 Folli C, Calderone V, Ramazzina I, Zanotti G &Berni R (2002) Ligand binding and ... retinol -binding proteins (CRBPs) and the cel-lular retinoic acid -binding proteins (CRABPs). CRBPs,including CRBPI, CRBPII, CRBPIII and CRBPIV,show greatest binding affinity for retinol and retinal,but ... genome.AbbreviationsCRABPIa and CRABPIb, cellular retinoic acid -binding protein type I a and b; CRBP, cellular retinol -binding protein; hpf, hours post fertilization;iLBP, intracellular lipid -binding protein; ...