RBP1 Protein, a cytoplasmic retinol-binding protein, functions in retinol uptake, storage, and retinoid homeostasis by accepting retinol from the transport protein STRA6. The interaction between RBP1 and STRA6 occurs specifically in the retinol-free apoprotein state. RBP1 Protein, Human is the recombinant human-derived RBP1 protein, expressed by E. coli , with tag free.