Brain protein in Parkinson's research, fluorescent light
micrograph. Fluorescent dyes have been used in these glial cells (brain
support cells) to highlight cellular structures and proteins: actin
(green), cell nuclei (blue), tau protein (red and pink). Actin is a
protein that is a major part of a cell's cytoskeleton. Tau protein is an
abundant neural protein, but aggregations of this protein are thought
to play a role in brain disorders such as Alzheimer's disease. Tau's
possible role in Parkinson's disease is being investigated here.
Roger J. Bick & Brian J. Poindexter / UT-Houston Medical School / Science Source
Science Source® is a registered trademark of Photo Researchers, Inc.
Spotted Salamander (Ambystoma maculatum) on a white background. A
mole salamander, the Spotted is fairly common in eastern North America
but it is rarely seen. This is because it spends most of its time
underground or under rocks, moss or leaf litter.
Noroviruses in the gastrointestinal tract. Noroviruses are a group
of related, single-stranded RNA, non-enveloped viruses that cause acute
gastroenteritis in humans. Noroviruses were previously known as
Norwalk-like viruses(NLV). Noroviruses spread from person to person
through contaminated food or water, and by touching contaminated
surfaces. It is recognized as the leading cause of nonbacterial
foodborne-disease outbreaks in the United States. Also shown are
cross-sections of villa and epithelial cells.