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Turnover of compound 18 catalyzed by PBP4. LC/MS TICs of compound 18 with PBP4 at (A) t = 0, and (B) t = 30 min. (C) TIC of the authentic synthetic tetrapeptide standard 31. The mass spectra of compound 18, of product 31, and of authentic synthetic standard 31 are given as inserts in each panel.
