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Schematic of the HA subunit and receptor binding site of 6D2. The 130 loop, 150 loop, 220 loop, and 190 helix were labeled. HA 150 [in another study (Auewarakul et al., 2007), this point is referred to as HA134] is indicated with an arrow. The molecular model was built using PyMol (v1.8.0.0; Schrödinger, LLC).
