FIG. 3.

Northern blots showing differential regulation of POX. Lanes contain 20 μg of total RNA derived from log phase B3 medium (lanes 1), carbon starved B3 medium (lanes 2), and defined salts medium with Avicel cellulose as sole carbon source (lanes 3). Following washes, the blot probed with the gpd housekeeping probe was exposed to XAR film (Kodak) for 5 h without an amplifying screen. The pox-probed blot was exposed overnight with an amplifying screen. Autoradiograms were scanned, and the digitized images were labeled in Photoshop Illustrator (Adobe, San Jose, Calif.).