On the absence of lipopolysaccharides in the endocellular symbionts of cockroaches and its evolutionary implications
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119 - 127
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The endocellular symbionts of cockroaches, closely related to the flavobacteria-bacterioides, are essential to their survival. Attempts to isolate and to characterize the lipopolysaccharides in the symbionts of Periplaneta americana - and quantitatively less reliable ones for Blattella germanica - failed to detect any of their characteristic components, as well as any of the endotoxicity usually associated with this macromolecule. Together with analogous results on other flavobacteria-bacteroids, and very different ones in other Gram-negative symbioses, this finding may help to address more precisely problems on the coevolution of animals and Gram-negatives.
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