title: Bivalent-cation-stimulated ATPase activity at preformed exocytosis sites in Paramecium coincides with membrane-intercalated particle aggregates.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D002413:Cations, Divalent; D002462:Cell Membrane / Q000201:enzymology / Q000648:ultrastructure; D004789:Enzyme Activation; D005089:Exocytosis; D005614:Freeze Fracturing; D008854:Microscopy, Electron; D010247:Paramecium / Q000201:enzymology / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D002413:Cations, Divalent; D000251:Adenosine Triphosphatases