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IR-ELDI mass spectra from (A) 1 μL of 200 μM bovine carbonic anhydrase, (B) 1 μL of 500 μM bovine serum albumin, and (C) 1 μL of 500 μM transferrin applied on-target. The inset shows an ESI mass spectrum for a solution of 10 μM bovine carbonic anhydrase in 50% acetonitrile and 0.1% formic acid (v/v).
