Anti U1-14NP antibody is seen in?-: (A) SLE, (B) Scleroderma, (C) MCTD, (D) Dermatomyositis
Answer is C. Robbins basic pathology 9th edition page no 135,Heading =Mixed connective tissue disease Mixed connective tissue disease have high titers of antibodies to an RNP antigen called U1RNP. This disease also have features suggestive of SLE, polymyositis, orSS.