ApyraseReceptors, Purinergic P2Y2Uridine TriphosphateReceptors, Purinergic P2NucleotidesUridine DiphosphateAdenosine TriphosphatePurinergic P2 Receptor AgonistsReceptors, Purinergic P2Y1Receptors, Purinergic P2Y5'-NucleotidaseReceptors, PurinergicReceptors, Purinergic P2X7Purinergic P2 Receptor AntagonistsSuraminExtracellular SpaceReceptors, Purinergic P2XNucleotidasesAdenosine DiphosphateExtracellular FluidAdenosinePyrophosphatasesAdenosine MonophosphateThionucleotidesSignal TransductionCalciumCells, Cultured