Lactobacillus sp. bacteria, coloured 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: x12,350 when printed 10 centimetres wide.
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