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  • blood
  • In pathologic conditions, the permeability of the epithelial lining may be compromised allowing the passage of toxins, antigens, and bacteria in the lumen to enter the blood stream creating a "leaky gut. (frontiersin.org)
  • Portal venous blood is an important source of bacteria for the liver. (vin.com)
  • structure
  • After entering the periplasmic space of its host the Bdellovibrio bacterium forms a structure called a bdelloplast which modifies both predator's and prey's cells. (wikipedia.org)