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Image of human TTR⋅holoRBP2 complex. TTR is shown in blue, RBP in red, and retinol in yellow. Coordinates are from the Research Collaboratory for Structural Bioinformatics protein data bank, ID code 1QAB, and the figure is produced by using INSIGHT II. Two equiv of T4, not present in this structure, would bind in the central cavity of TTR shown in the center of the image.
