Matrix Metalloproteinases and Autoimmune Bulbous Diseases: Expression of MMP-2, -3, and -9 in Bullous Pemphigoid, Pemphigus Vulgaris, and Pemphigus Foliaceus.

BACKGROUND: Matrix metalloproteinases (MMPs) participate in extracellular matrix degradation and may play an important role in basal membrane damage in many dermatologic diseases.