Membrane Structure and Function
Exocytosis is the secretion of proteins

out of the cell across the plasma membrane into the intracellular space
out of the cell across the plasma membrane into the extracellular space
is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane
is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane

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