MECA-79 staining of vessels in ulcerative colitis. A section of inflamed colonic mucosa from an ulcerative colitis patient was immunostained with MECA-79 by standard procedures. Signal (brown) is present on vascular endothelial cells in several HEV-like vessels. This result is in agreement with the report of Kobayashi et al.9 The immunohistochemistry was performed by Mark Singer. The paraffin block was provided (UCSF Committee of Human Research approval no. H1060-28 724). This research was supported by NIH grants by Dr Annemieke Van Zante, Department of Pathology, UCSF. R01-GM57411 and R01-GM23547 to S.D.R.
