Schematic Graphic (IMAGE) Institute for Basic Science Caption At the detachment area (abscission zone) cell processing enzymes (black and red Pac-Man-shaped circles) separate the cell wall between neighboring cells. Residuum cells (blue) are retained by the plant, while secession cells (light brown) of petals and sepals are shed and surrounded by a lignin brace (purple). The open cut is sealed with a protective cuticle layer (dark brown). Credit Elsevier Inc. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.