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Antibacterial activity of Tn5 insertion mutants of P. carotovorum subsp. carotovorum Pcc21 against the indicator strain Pcc3. Pcc21, P. carotovorum subsp. carotovorum Pcc21 wild-type strain; DK1, -2, -6, -7, and -9, P. carotovorum subsp. carotovorum Pcc21 mutant strains (loss of low-molecular-weight bacteriocin activity). The photo was taken 24 h after the indicator strain had been overlaid.
