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Electrospray mass spectra of MMP-3-affinity purified N-TIMP-1 (A) and N-TIMP-1 not bound to an MMP (B), separated by Superdex 75 size exclusion chromatography. Each fraction was infused by electrospray on a Finnigan LCQ Classic Ion-Trap mass spectrometer. Higher apparent masses than in Fig. 5 are attributed to lower mass accuracy of the Finnigan LCQ.
