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<p><b>Bacterial secretion systems</b> are protein complexes present on the <a href="page.php?w=cell_membranes">cell membranes</a> of <a href="page.php?w=bacteria">bacteria</a> for <a href="page.php?w=secretion">secretion</a> of substances. Specifically, they are the cellular devices used by pathogenic bacteria to secrete their <a href="page.php?w=virulence_factor">virulence factor</a>s (mainly of proteins) to invade the host cells. They can be classified into different types based on their specific structure, composition and activity. Generally,</p><p>
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