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Um bacteriófago T4 chega a uma colônia de E. coli e geralmente causa muitos problemas para eles. Depois que o vírus reconhece e se liga a uma célula hospedeira usando domínios de ligação do receptor que reconhecem o epítopo da superfície bacteriana, sua bainha da cauda se contrai, injetando seu dsDNA no citoplasma da célula. ⠀⠀⠀⠀⠀⠀⠀⠀⠀ O DNA é transcrito em RNA, que então desliga os processos normais na célula e, em vez disso, direciona a síntese de proteínas virais dentro da bactéria.
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