By tagging a cell's proteins with fluorescent beacons, Cornell researchers have found out how Escherichia coli bacteria defend themselves against antibiotics and other poisons.
When undesirable molecules show up, the bacterial cell opens a tunnel though its cell wall and "effluxes" the intruders, i.e., pumps them out.
"Dynamic assembly of these tunnels has long been hypothesized," Cornell professor of chemistry and chemical biology Peng Chen said. "Now, we see them."<
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