Figure 1.

Immunolabelling of a section of the distal ileum containing Peyer's patches with PrP antibody R145. a-b) PrP^d accumulation is visible in lymphoid follicles of two lambs (a = 516/7, b = 517/7) fed milk from scrapie-affected ewes. c) PrP^d immunolabelling is absent in lymphoid follicles of the control lamb (c = 548/7) reared by its TSE-free dam. Scale bars, 100 μm.