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Ultrastructural and biochemical studies of the dermis from patients with pseudoxanthoma elasticum are described. Elastin fibers showed mineral deposits that were associated with an elastin material exhibiting altered affinity for the electron microscopical stains and altered ultrastructural organization. In the most affected patient the elastin was shown to be increased and to have an abnormal amino acid composition. In some patients the collagen fibers were laterally fused. The ground substance was increased as evidenced by electron microscopy and confirmed by a slight increase in uronic acids, hexosamines, and neutral sugars.
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