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Expression and purification of recombinant OmpL1 proteins. Lanes 1 and 6: protein markers (BioColor); lane 2: pET42a with no inserted ompL1 genes; lanes 3 to 5: the expressed rOmpL1/1, rOmpL1/2 and rOmpL1/3, respectively; lanes 7 to 9: the purified rOmpL1/1, rOmpL1/2 and rOmpL1/3, respectively.
