S-02 Molecular Mechanism of Purinergic Signal Transmission and Related Drug Development S02-1 Purinergic signal transmission and vesicular nucleotide transporter S02-2 Function and localization of vesicular nucleotide transporter in rodents S02-3 Astrocyte-to-astrocyte and astrocyte-to-neuron communications mediated by extracellular ATP      S02-4 Identification of vesicular nucleotide transporter (VNUT) in taste cells S02-5 Roles played by presynaptic P2X receptor channels in the brain      S02-6 A purine system in neuropahtic pain: a representative of purinergic transmission,  problems and the prospects