title: Impermeable 'silvery' layers in fish.
mesh_terms: D000400:Air Sacs / Q000502:physiology*; D000818:Animals; D002245:Carbon Dioxide; D002463:Cell Membrane Permeability; D004848:Epithelium / Q000502:physiology; D005399:Fishes / Q000502:physiology*; D009584:Nitrogen; D010100:Oxygen
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen