Expression of P2YR linked to calcium stores in rodent C6 glioma. The levels of receptor subtype P2Y1, P2Y2, P2Y4 and P2Y6 were examined in control and ATP-stimulated C6 cells (100 μM; 4 h exposure). The number of PCR cycles was 35 for all receptor subtypes. GAPDH served as a reaction standard. Data are representatives from 4 independent experiments.