Zhang, Jianzhi Positive selection, not negative selection, in the pseudogenization of rcsA in Yersinia pestis. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Oct 2008 - E69; author reply E70 p. digital Publication Type: Letter; Comment ISSN: 1091-6490 Standard No.: 10.1073/pnas.0806419105 doi Subjects--Topical Terms: Bacterial Proteins--geneticsEvolution, MolecularGenes, Bacterial--geneticsPseudogenes--geneticsSelection, GeneticYersinia pestis--genetics