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The superposition of the spatial structures of Ω-loops of class A β-lactamases in trace presentation, TEM-1 (green), TEM-64 (red), SHV-1 (yellow), CTX-M-96/12 (violet), CTX-M-44 (blue), TOHO-1 (black), PSE-4 (orange), KPC-2 (cyan), L2 (brown), SFC-1 (light-blue).
