Vinca AlkaloidsCyclic Nucleotide Phosphodiesterases, Type 1PurinonesNootropic AgentsPiracetamPhosphodiesterase InhibitorsAntimetabolitesBody Weights and MeasuresPhosphoric Diester HydrolasesBiological AvailabilityScavenger Receptors, Class ECell TransplantationVasodilator AgentsCyclic GMPChromatography, High Pressure LiquidArea Under CurveWound Healing