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Analysis of interaction between OXA-48 and meropenem by ESI-MS: (A) mass spectrum of denatured OXA-48, mass at 29,174.6 Da; (B) mass spectrum of denatured OXA-48 after incubation with meropenem, apo OXA-48 (29,174.8 Da), and two meropenem binding product (29,514.0 Da and 29,558.1 Da).
