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Deconvoluted full scan mass spectra taken in positive ion electrospray ionization mode of (A) control HSA; (B) 0.01 mM 4,4′-MDI adducted HSA; (C) 0.1 mM 4,4′-MDI adducted HSA; and (D) 1.0 mM 4,4′-MDI adducted HSA. The single asterisk indicates the first isomer of HSA while the double asterisk indicates a second isomer. The change in molecular weight is 224 Da.
