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Mass spectral analysis of lung tissues. (A) Annotated stained section of lung tissue. Colors indicate different-size arteries: < 200 μm, yellow; 201-400 μm, green; 401-600 μm, blue. (B) Matrix spotted serial section on a MALDI target. (C) Average mass spectra of IPAH and control showing the intensity difference for the peak at m/z 2535.
