Peroxisomal localization of Arabidopsis isopentenyl diphosphate isomerases suggests that part of the plant isoprenoid mevalonic acid pathway is compartmentalized to peroxisomes.

The electronic form of this issue, available as of November 11, 2008, at www.plantphysiol.org, is considered the journal of record. On the Cover: A confocal three-dimensional maximum intensity projection of Bacillus subtilis biofilm formation (green) on living Arabidopsis thaliana Col-0 root stained with Calcoflour White (blue). Bacteria and plant nuclei (green) stained green with vital nucleic acid stain Syto 13. The cover image was created and provided by Drs. Thimmaraju Rudrappa and Kirk Czymmek of the University of Delaware. (See Rudrappa et al., pp. 1547–1556.)