Figure 1From: Comparative evidence for a link between Peyer's patch development and susceptibility to transmissible spongiform encephalopathiesComparison of Peyer's patch lymphoid follicles in the ileum of NPU Cheviot sheep at (A) 4 months, (B) 15 months, and (C) 6 years, using haematoxylin and eosin staining. F, lymphoid follicles undergo involution and are fewer in number with increasing age; L, intestinal lumen. Bar = 200 μm.Back to article page