Membranes and transport.
D001692:Biological Transport; D001693:Biological Transport, Active; D008563:Membrane Lipids / Q000502:physiology; D008565:Membrane Proteins / Q000502:physiology; D008566:Membranes / Q000502:physiology* / Q000648:ultrastructure; D008954:Models, Biological; D011487:Protein Conformation
D008563:Membrane Lipids; D008565:Membrane Proteins