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Science 23 November 2001:
Vol. 294. no. 5547, pp. 1634 - 1635
DOI: 10.1126/science.294.5547.1634b
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News of the Week

MICROBIAL GENOMES:
Sequences Reveal Borrowed Genes

Elizabeth Pennisi

New data emerging from microbial genome sequences are so perplexing that they call into question what defines a species. Two bugs in particular, described at a recent meeting, seem to have nabbed enough genes from other organisms that they no longer resemble their supposedly closest relatives--raising fascinating questions about how and why they obtained these new traits.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)