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. 2023 May 12:1–19. Online ahead of print. doi: 10.1038/s41573-023-00692-8

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Fig. 2 — a, The inhibitor ensitrelvir (PDB: 7VU6) is bound¹⁸. b, The inhibitor nirmatrelvir (PDB: 7RFS) is bound²⁵. The colours indicate the various binding pockets following the standard Schechter and Berger nomenclature for proteases²⁵⁴: P1′ (orange), P1 (yellow), P2 (blue) and P3–5 (cyan). SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.