Digestion
Molecular syringe
#### Molecular syringe

A [type III secretion system](/wiki/Type_III_secretion_system "Type III secretion system") means that a molecular syringe is used through which a bacterium (e.g. certain types of *Salmonella*, *Shigella*, *Yersinia*) can inject nutrients into protist cells. One such mechanism was first discovered in *Y. pestis* and showed that toxins could be injected directly from the bacterial cytoplasm into the cytoplasm of its host's cells rather than be secreted into the extracellular medium.Salyers, A.A. \& Whitt, D.D. (2002\). *Bacterial Pathogenesis: A Molecular Approach*, 2nd ed., Washington, DC: ASM Press. 


What are some examples of bacteria that use molecular syringes to inject nutrients or toxins?