Figure 1: Expression of CD4+CD25+CD T cells (Tregs) in blood sample of pretreatment, posttreatment, and control groups (Pre-T: pretreatment, Post-T: posttreatment). (a) CD4+CD25+CD lymphocytes shown by FACS. (b) CD4+ T cells percentage in peripheral blood lymphocytes. (c) CD4+CD25+CD T cells percentage in CD4+ T cells (, compared with Pre-T). (d) Comparison of peripheral blood Tregs in individual patients with thyroid papillary carcinoma before and after 131I radioablation.