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Among all bacterial phyla, only cyanobacteria appear to be true introverts, probably due to their capacity to conduct oxygenic photosynthesis, using a complex system of intracellular membranes.

Michael Y Galperin

BMC Microbiology 5 (7), 14 Jun 2005

Transmembrane and intracellular sensors: Extroverts and introverts Analysis of complete microbial genomes revealed complex systems of intracellular monitoring that included PAS- and GAF-containing proteins with a variety of output domains [ 3 ].

Michael Y Galperin

BMC Microbiology 5 (7), 14 Jun 2005

Keeping in mind all these caveats, the predominance of extracellular or intracellular transducers can be used to distinguish organisms that are concerned primarily with sensing environmental parameters ("extroverts") from those more closely monitoring the intracellular milieu ("introverts").

Michael Y Galperin

BMC Microbiology 5 (7), 14 Jun 2005

Hence, it seems that the trend of autotrophic bacteria and archaea being more of 'introverts' and heterotrophic bacteria being more of 'extroverts' might be biased by the current selection of the completely sequenced genomes.

Michael Y Galperin

BMC Microbiology 5 (7), 14 Jun 2005

The availability of this resource, as well as introduction of the concepts of bacterial IQ, introverts and extroverts among the prokaryotes, should help in achieving a better understanding of the microbial behavior and forces that shape microbial genome evolution.

Michael Y Galperin

BMC Microbiology 5 (7), 14 Jun 2005