Procedure;Region Oesophagus;"Cardiac stomach";"Fundic stomach";"Pyloric stomach";"Pyloric caeca";"Anterior intestine";"Posterior intestine" PAS;++;++;++;++;+;++;++ "AB pH 2.5";–;–;–;–;++;++;++ "AB + PAS (pH 2.5)";+;+;+;+;+;++;++