#semipermeable_membrane__semipermeablemembrane  a membrane (as a cell membrane) that allows some molecule to pass through but not others
  supertype:  #tissue_layer__membrane  a pliable sheet of tissue that covers or lines or connects organs or cells of animals
  subtype:  #cell_wall__cell_membrane__plasma_membrane  a thin membrane around the cytoplasm of a cell; controls passage of substances in and out of the cell

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