672959.fig.002a
(a)
672959.fig.002b
(b)
672959.fig.002c
(c)
672959.fig.002d
(d)
Figure 2: (a) A small artery in the intestinal submucosa showing necrotizing arteritis (H&E). (b) A higher power view of the same vessel showing early fibrin formation in the lumen (arrow). (c) A high power view of another vessel emphasizing the necrosis and the largely neutrophil reaction (H&E). (d) A randomly selected artery illustrating the heavy deposition of IgA (immunofluorescence with an alpha chain-specific antibody).