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Intensities of the two fragments of histone H1 in control (open box) and IPAH (black box) pulmonary arteries. The fragment with a mass to charge (m/z) of 2140 was identified by LC-MS and the second fragment (m/z 2535) was identified by MALDI MS directly from the tissue section and MASCOT searching. Data are mean + SEM; *P < 0.05 when IPAH compared to controls.
