Photomicrograph of thymus sections stained with H&E. Balb/c mice (6 to 8 weeks old) were treated with a continuous infusion of VEGF (50 ng/h). Mice were killed on days 14, 21, and 28. (A) Photomicrographs are representative of 3 or more independent experiments (original magnification, × 20). (B) Control and VEGF-treated thymus sections following 28 days of infusion from panel A at higher magnification (× 400).