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MMP9 expression and neutrophils and macrophages in the lung tissues of cadavers with AAD complicated with lung injury using immunofluorescence labeling. Colocalization of MMP9 and CD68 was observed in the lung tissues in AAD patients, but rare colocalization of MMP9 and MPO was observed, which indicated the MMP9 was mainly derived from the macrophages in lung tissues. Green color: MPO (neutrophil) and CD68 (monocyte/macrophage), red color: MMP9, blue color: nucleus.
