Fig. 4.
Vascular structures in Burkitt tumors treated with vasostatin, murine IL-12, or vasostatin plus murine IL-12 detected by immunohistochemical staining of murine CD31.
Counterstained with hematoxylin, original magnification ×20. Tumor tissue from animals treated with (A) buffer alone; (B) vasostatin alone; (C) murine IL-12 alone; and (D) vasostatin plus murine IL-12.