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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

Developing nerve cells...I just cannot get over the marvel of the making of our bodies...

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.

Yersinia pests | Gram-negative rod-shaped bacterium. It is a facultative anaerobe that can infect humans and other animals. Human Y. pestis infection takes three main forms: pneumonic, septicemic, and the notorious bubonic plagues.

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

Human embryonic stem cells

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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

Fractal symmetry - Fossilised ancient single cell organism, Radiolarian, one of the first forms of life on the planet. Photographed using SEM at 1700 x magnification

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

WIREDfrom WIRED

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

Most detailed model to date of Human Immunodeficiency Virus (HIV).....looks scary!