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Ventilation ducts, Fungal growths, Cables and wires, Bioluminescent organisms, Metallic struts, Microchip arrays, Nerve-like filaments, Structural supports, Gaseous plumes, Circulatory tubes, Cellular aggregates, Energy conduits, Pneumatic systems, Biomechanical limbs, Gas jets, Synthetic membranes, Neurotransmitter receptors, Sensors and transducers, Microorganisms, Optical fibers, Tissue-like growths, Mechanical pistons, Electrical grids, Gas diffusion chambers�