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The form of membrane trafficking that involves substance transport outside the plasma membrane is called secretion . Both donor and defect densities were reduced significantly by compensating with B. Measurement of QE vs. voltage revealed that the data could be described well with a model which assumes that transport outside the depletion layer is by diffusion . Actually , the INRIA lab is outside the scope of this compagny , but a few lines take people that far with VFD rates for transport outside the Semitag scope .