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Science 23 April 2004:
Vol. 304. no. 5670, p. 503
DOI: 10.1126/science.304.5670.503
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News of the Week

PALEONTOLOGY:
New Biomarker Proposed for Earliest Life on Earth

Richard A. Kerr

On page 578, geoscientists report the discovery of microscopic tubules in 3.5-billion-year-old sea-floor rock that strongly resemble microtubules apparently bored in modern sea-floor rock by microorganisms.

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