CJD brain slides. Microscope slides of sections of a human brain with new variant Creutzfeldt-Jakob disease (vCJD). The slides are being stained to show the presence of virus-like prions within the brain. The prions result in the appearance of large vacuoles and protein plaques, making the brain spongy and killing off the tissue. Symptoms include dementia and sudden muscle contractions, leading to death. The similarly fatal cattle disease BSE (Bovine Spongiform Encephalopathy) has now been linked to human vCJD. Photographed at the UK CJD Surveillance Unit in Edinburgh, Scotland.

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