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Stenocarpella maydis, a fungal pathogen of maize, produced polygalacturonases (PGs) when grown on pectin or maize cell walls. An extract from bean (Phaseolus vulgaris L.) which contained an active inhibitor of Aspergillus niger PG, also inhibited S. maydis PG in a reducing sugar assay. Bean polygalacturonase inhibitor protein (PGIP) was purified from the extract by affinity chromatography, and this...