STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Lactobacillus casei bacteria, scanning electron micrograph (SEM). Lactobacillus bacteria are probiotic bacteria, which are useful for human and animal health as they produce bacteriocins (toxins that kill off competitive bacteria), which prevents infection by pathogenic bacterial strains. They are usually added to probacterial foods such as yoghurts and health bars. Magnification: x3000 when printed at 10 centimetres wide.
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