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The outer membrane (OM) of Gram-negative bacteria is designed to exclude potentially harmful molecules. This property presents a challenge for bacteria that must secrete proteins and large glycoconjugates to grow, divide, and persist. Proteins involved in trafficking such molecules have been identified, but their precise roles are often unresolved due to the difficulty in capturing "snapshots" during the export pathway. Wza is the prototype for the large family of OM polysaccharide exportdoi:10.1073/pnas.1400341111 pmid:24843147 pmcid:PMC4050593 fatcat:ybabs3movnhddnmxejsgvtxypy