= Selective permeability
<Selective permeability> means that a <cell membrane> permits different substances to pass at different rates under comparable conditions. Both the <lipid bilayer> and the available <membrane proteins> contribute to this selection.
Artificial boundaries can also have <selective permeability>. For <osmosis>, specify which <solutes> cross and over what observation interval: a boundary that retains one <solute> need not retain another. A <semipermeable membrane> is the ideal solvent-only boundary used in the <osmotic pressure> calculation.
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