Tiny toxic proteins help gut bacteria defeat rivals
Microcins attack pathogens involved in gut inflammation
![E.coli](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/11/121016_notebook_saywhat_free.jpg?fit=860%2C460&ssl=1)
GERM WARFARE When iron gets scarce, a bacterium called E. coli Nissle deploys molecules called microsins that kill some other types of bacteria, including other strains of E. coli.
NIAID