Prions are biological anomalies – self-replicating, not-alive little particles that can misfold into an unstoppable juggernaut of fatal disease. Prions don't contain genes, and yet they make more of ...

This is the first article in a series on viroids. Viruses, bacteria, and fungi; most people will have heard of these three major types of disease-causing microbes. Some will also have heard about ...

This article is part of a series on viroids. The first, which can be read here, gave an overview of what viroids are and how they replicate. The second article described the plant host range of ...

Vacuoles of varying sizes in the frontal cortex were seen on staining with hematoxylin and eosin (Panel A). Several deposits of abnormal prion protein (Panel B, arrows) were seen on ...