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. 2012 Jul 15;2012:405842. doi: 10.1155/2012/405842

Figure 1.

Figure 1

Outline of the major difference between the protein secretion system of Gram-positive and Gram-negative bacteria. Presence of thick outer membrane in Gram-negative bacteria demands for outer membrane permeabilization through the addition of mild detergent, lpp deletion, or by fusing the recombination protein with kill or out gene.