Optical changes in the voltage-clamped squid axon.
D000818:Animals; D001369:Axons / Q000502:physiology*; D001718:Birefringence; D004594:Electrophysiology; D008564:Membrane Potentials; D008974:Mollusca; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism
D012964:Sodium; D011188:Potassium