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Crystal contacts of the Sec13 ²-propeller. A Sec13 reference molecule is shown in orange, with neighboring molecules from five different crystal structures (PDB accession codes 2PM6, 2PM9, 3BG1, 3JRO, 3JRP) superimposed to indicate the number and variety of ²-propeller-²-propeller contacts that the Sec13 molecule can make in the crystal. Neighboring molecules from the same crystal are colored in the same shade of blue.
