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Model for cell adhesion and cell separation. Cross linking of the de-esterified pectin polymers maintains cell adhesion at the level of the middle lamella. Degradation of the de-esterified pectins by enzymes like polygalacturonases weakens connections and leads to cell separation. HG: homogalacturonan; RG: rhamanogalacturonan; PME: pectin methyl-esterase; PG: polygalacturonase.
