Proteome profiles of X . a . pv . citri biofilms and planktonic cultures. Proteins extracts (approximately 50 μg) from X. a. pv. citri biofilms (left gel) and planktonic cultures (right gel) were separated by 2D gel electrophoresis using 7-cm IPG strips pH range 4–7 and 12% SDS-PAGE. Proteome profiles of the cultures were compared using the Delta-2D (Decodon, Greifswald, Germany) analysis software.