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ABP1 Regulates Clathrin-Dependent Endocytosis.
Unbound extracellular ABP1 appears to promote clathrin-dependent endocytosis (top scheme). Auxin binding to ABP1 interferes with this activity and hence reduces clathrin-dependent endocytosis, leading to higher retention of PIN proteins and, subsequently, higher auxin efflux rates (bottom scheme).
