Photomicrographs of attached and injected CD34⁺ cells.

Represented are CD34⁺ cells maintained in suspension (A) or attached to FN-coated dishes in the absence (B) or presence of TS2/16.2.1 mAb (C) or RN-coated dishes (D-F). Injection of attached CD34⁺ cells is shown in panel E. Note the injection needle (arrow) and cells injected with OG-dextran (arrowheads). A fluorescence micrograph (F) of the identical field shown in panel E demonstrates the successful delivery of fluorescent material (arrowheads). Images in panels E-F were captured from videotape during a live injection session and, therefore, display a decreased resolution, compared with images in panels A-D.