Antibiotics are on medicine, not only because it is useful to kill microorganisms, but also because of useless to human cells, they won't do the same with the destruction of human cells, bacterial cells completely different, so they can avoid being also destroyed. Thus, can be used for special antibiotics at certain microorganisms, they called the "magic bullet". The characteristics of antibiotics are also make them with a agent for many different: the latter are toxic, whether the bacterial cells or cell of human cells.
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