Table 2

Inducers of aggregate formation and their subsequent activities

Potential inducerFormation of aggregatesMigration to the poresColonization of the light organ
Gram-negative bacteria
V. fischeri+++
V. fischeri (nonmotile)+
V. parahaemolyticus++
Escherichia coli
  (heat-killed)+
Gram-positive bacteria
Bacillus cereus
Listeria monocytogenes
Polystyrene microbeads
 Alone
 With V. fischeri cells+
 With purified
  lipopolysaccharide