exo-poly-alpha-digalacturonosidase; pehX (gene name); poly(1,4-alpha-D-galactosiduronate) digalacturonohydrolase; exopolygalacturonosidase (misleading); poly[(1->4)-alpha-D-galactosiduronate] digalacturonohydrolase; exo-poly-alpha-galacturonosidase