Variation in lps gene clusters within the xanthomonads. The genes that are adjacent to metB and etfA in different xanthomonads are indicated. Dashed lines represent the remainder of the lps cluster. Empty and filled boxes represent sequences specific to Xoo and Xcc respectively. Boxes with dots indicate that the sequences are either from or related to Xac genes. Box with stripes represents sequences that are related to Pseudomonas syringae pv. tomato. Arrows indicate transcriptional orientation. The wzm gene encodes a predicted ABC transporter permease protein, wxoA encodes a predicted epimerase, wxcA encodes a glycosyl transferase and wxcH encodes a hypothetical protein.