Figure 3. Interstitial fluorescence after administration of fluorescein isothiocyanate conjugated to bovine serum albumin (FITC-BSA) to (A) control and (B) normothermic animals subjected to intestinal ischemia. FITC-BSA was contained within the vessels in control animals, which appear white against a relatively black background. The capillaries within the villus are easily identified. Ischemia–reperfusion induced leakage of FITC-BSA (MML) from the capillaries into the interstitium, and a brighter flare surrounded the villi. Congestion of red blood cells was often observed within the villus capillaries. Magnification ×590.