PRR2 expression on HUVEC by confocal microscopy. After trypsinization, HUVEC were plated on coverslips for 6 hours. Nonconfluent HUVEC were stained with an isotypic-matched control antibody (A), the MoAb R2.477 (B), and the MoAb against PECAM-1/CD31 (C) and then with goat antimouse FITC antibody. Confocal acquisitions were then performed at a 63× magnification.