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Figure 7
2Fo − Fc electron-density map consistent with a bound CO2 molecule (r.m.s.d. 0.3) next to Asp128 in subtype N9 neuraminidase (from noddy tern; PDB entry 6hfc, 1.29 Å resolution). The CO2 molecule was refined with 0.5 occupancy, as was the neighbouring partially decarboxylated Asp128 residue (Rfree = 0.164, Rwork = 0.141). |

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