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The three dimensional crystal structure of the retinol-RBP-TTR complex. The structure of the human retinol-RBP-TTR complex (PDB ID 1QAB) was rendered using Pymol (http://www.pymol.org/). The TTR tetramer (blue) is comprised of a dimer of dimers with two RBP molecules (green) bound to the opposite dimers. Interactions between RBP and TTR are mediated by residues at the entrance to the ligand binding pocket and span across the two TTR dimers.
