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Schematic of the COBRA P1 H1N1 HA trimerized proteins. Each COBRA HA structure presented was generated using the 3D-JIGSAW algorithm, and renderings were performed using MacPyMol. The Sa site is shown in cyan, the Sb site in pink, and the Cb site in dark blue. The glycans at residues 142 and 144 are highlighted in green, and the K147 residue is highlighted in purple.
