Given the rate of endocytosis, the rate at which exocytosed membrane could extend the front of a fibroblast is ∼1 μm per min. Indeed, this is the speed with which these cells extend forwards ...

By contrast, the bulk of endocytosis is often viewed as a constitutive process that ensures the continuous recycling of membrane components. In a recent paper (Mol. Cell 7, 421–432; 2001 ...

One key process in maintaining this equilibrium is endocytosis, the mechanism by which membrane components are internalised. Organisms have evolved various endocytic pathways, all relying on ...