Laser scanning confocal microscopy. (A) Paraformaldehyde (2%) fixed but nonpermeabilized HUVEC grown on microscope slides were incubated with mAbs C2562, C2931, C1801, and mouse IgG. (B) Unfixed and nonpermeabilized HUVEC grown on microscope slides were incubated with mAbs C2562, C2931, C6909, and mouse IgG. The panels to this figure are photomicrographs of the laser scanning confocal microscopy. The table between the laser scanning photomicrographs lists the mAb clones and the cytokeratins they react to. The figure is a representative presentation of multiple experiments.