CD69 and Werner syndrome: The total percentage of monocytes (CD14+), CD4+ T cells (CD3+, CD4+, CD25+, CD69+), CD8+ T cells (CD3+, CD8+, CD25+, CD69+), B cells (CD3+, CD19+), NK cells (CD3−, CD56+), and NKT- cells (CD3+, CD56+) were detected by immunofluorescence phenotyping, and we found no difference between patients with WS and controls.