title: Ca and Na spikes in egg cell membrane.
abstract: Na, Ca and K channels of the cell membrane are distinguished by different kinetics of their currents, by their different ion selectivities, and by their different sensitivities to different pharmacological agents. These channels are already found in unfertilized egg cells in many animals. Elimination of existing channels and creation of new channels occur during the process of differentiation.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism*; D005260:Female; D007700:Kinetics; D008564:Membrane Potentials; D009132:Muscles / Q000378:metabolism; D010063:Ovum / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism*; D013215:Starfish
chemical_list: D012964:Sodium; D011188:Potassium; D002118:Calcium