Sweetening AgentsPlant TubersSolanum tuberosumCold TemperatureCyclic AMPColforsinCalcimycinCells, CulturedTetradecanoylphorbol AcetateCalciumCell LineKineticsTumor Cells, CulturedProtein Kinase CRats, Inbred StrainsDose-Response Relationship, DrugAntineoplastic AgentsRNA, MessengerMolecular Sequence DataTime FactorsSignal Transduction