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Autoantibodies Recognizing Specificity Protein 4 Co‐occur With Anti–Transcription Intermediary Factor 1 and Are Associated With Distinct Clinical Features and Immunogenetic Risk Factors in Juvenile Myositis
Muscle Disease Unit, Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland, and Department of Neurology, Johns Hopkins University School of Medicine
Muscle Disease Unit, Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, and Department of Medicine, Johns Hopkins University School of Medicine
for the Childhood Myositis Heterogeneity Collaborative Study Group