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Science 7 February 1997:
Vol. 275. no. 5301, p. 790
DOI: 10.1126/science.275.5301.790
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Perspectives

Jeffrey D. Palmer

The organelles of eukaryotic cells--chloroplasts and mitochondria--first arose as engulfed symbionts with their own genomes. They subsequently lost most of their genes to the nucleus, retaining a few that could not be transferred. In his Perspective, Palmer discusses recent evidence that suggests that another organelle, the hydrogenosome, is a highly modified mitochondrion that has lost all of its genetic material.

The author is in the Department of Biology, Indiana University, Bloomington, IN 47405, USA. E-mail: jpalmer{at}bio.indiana.edu Also see the archival list of Enhanced Perspectives

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