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Schematic of the theorized stages of fruit abscission across development: 1) pedicel abscission zone (AZ) cell differentiation; 2) acquisition of competence to endogenous/exogenous abscission promoting signals such as ethylene or abscisic acid; 3) proximal lignin deposition and AZ cell separation via middle lamella degradation; 4) physical separation along the AZ and cuticle formation on the remaining proximal pedicel. Diagram is not to scale and steps may temporally overlap.
