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Immunofluorescence studies in progressive systemic sclerosis (scleroderma) and mixed connective tissue disease

Immunofluorescence (IF) investigations of the skin were performed in thirty patients with progressive systemic sclerosis (scleroderma) and eight patients with mixed connective tissue disease (MCTD). The results show that speckled epidermal nuclear immunoglobulin deposition occurs not only in MCTD but also in true scleroderma. Granular IgM deposition at the dermo‐epidermal junction of light‐exposed skin was detected in both groups of patients, but six of eight MCTD patients also showed a granular IgM band in non‐exposed skin.