CD4 and Schwartz-Jampel syndrome: A blood 4-cell disease signature including plasmacytoid dendritic cell, CD4+ T cell, memory B cell, and human leukocyte antigen (HLA)-DR+CD4+ T cells was defined in this manner and was able to diagnose SjS with good accuracy in two different cohorts of patients (AUC 0.86–0.89).