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Mixed Connective Tissue Disease (MCTD) refers to a an ‘overlap’ condition where patients develop features of other autoimmune conditions such as Raynaud’s, taught finger swelling (features of early scleroderma), arthritis and muscle inflammation (myositis). It is important to distinguish MCTD from other overlap conditions. The antibody hallmark of MCTD, and requirement for the classification and diagnosis of the disease is anti-U1-RNP.