FIG. 1.

Organization of the ORFs in the fpd gene regions of Arthrobacter sp. strain IF1. Open arrows indicate the size and direction of each ORF. ORFs that are expected to be involved in 4-FP metabolism are labeled with fpd. Heavy solid lines delineate regions of high similarity between cluster A and cluster B; heavy dashed lines delineate regions of high similarity between the clusters indicated and the 4-nitrophenol gene region (39); heavy dotted line delineates regions of lower similarity between cluster B and the 4-nitrophenol gene region.