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The pathogenesis of the tissue damage and fibrosis in sarcoidosis is poorly understood. The matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs) must be considered in this regard, because they control the lysis of connective tissue components. Immunohistochemical studies (peroxidase and dual labeling for confocal microscopy) of reactivity for MMP-1, MMP-2, MMP-3, MMP-7, MMP-9, and...