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E. coli--part of the normal flora of the human gut. Certain strains of E. coli produce various toxins that cause illness

In this image, human neutrophils are engulfing Streptococcus pyogenes cells through a process known as phagocytosis.

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Definition Genetic engineering and Properties of Embryonic and Adult Stem cells (Material and Methods)

Human embryonic stem cells

Helicobacter pylori. Coloured transmission electron micrograph (TEM) of a Helicobacter pylori bacterium (formerly known as Campylobacter pyloridis). Colonies of H.pylori occur on the stomach mucous membrane in people suffering gastritis, and this bacteria has been linked to stomach ulcer formation.

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As pretty as a picture (but a lot more deadly): Killer diseases as you've never seen them before

E. coli bacteria, which under certain conditions can cause gastroenteritis and urinary tract infections. Some.strains also cause food poisoning. Magnification: x17,000

Campylobacter bacteria are the number-one cause of food-related gastrointestinal illness in the United States. ARS scientists are currently sequencing multiple Campylobacter genomes. This scanning electron microscope image shows the characteristic spiral, or corkscrew, shape of C. jejuni cells and related structures. Photo by De Wood; digital colorization by Chris Pooley.

Human skin cells. Okay, this isn't weird. But it's weird to see it magnified, and it is cool. PiR Resourcing Life Science

Staphylococcus bacteria. Most common of the 1 trillion bacteria that live on our skin. Only a few strains of this bacteria are harmful and cause staph infections or toxic shock syndrome. Most are harmless.

These 12 Viruses Look Beautiful Up Close But Would Kill You If They Could (PHOTOS)


Beautiful, Strange and Geeky: Top Science Image Galleries of 2011

Most detailed model to date of Human Immunodeficiency Virus (HIV) via Wired

Staphylococcus aureus bacteria. Colored SEM of Staph aureus bacteria (yellow) on human nasal epithelial cells.