PTH increased the endothelial progenitor cells in the peripheral blood.

<p>Six days after stroke with PTH or saline treatment, blood samples were collected. FITC-conjugated CD34 and PE-conjugated VEGFR2/Flk1/KDR labeled cell populations were measured by BD FACSCalibur flow cytometer. <b>A</b>–<b>C</b>. Representative results of Fluorescence Activated Cell Sorting (FACS) are shown in A (sham control), B (stroke plus saline), and C (stroke plus PTH). <b>D</b>. The bar graph shows quantified data with a significant increase in CD34+/Flk1+ cells in stroke plus PTH group. N = 5 animals in each of the three groups; * <i>P</i><0.05 vs. sham and stroke controls.