Disease-unspecific, antibody-related immunolabelling in a BSE-inoculated pig presenting neurological signs in the absence of pathological evidence of disease. Serial coronal sections (A and B) of rostral midbrain (oculomotor nerve nucleus) of pig PR442. A) No evidence of PrPd immunolabelling with mAb 2G11. B) Presence of ubiquitous disease-unspecific labelling of neuronal perikarya experienced in pig brain with mAb L42. Scale bars: 50 μm.