Coepxression of ligand-gated P2X and G protein-coupled P2Y receptors in smooth muscle. Preferential activation of P2Y receptors coupled to phospholipase C (PLC)-betal via Galphaq/11 and to PLC-beta3 via Gbetagammai3 - Murthy,K.S.; Makhoulf,G.M. (J Biol Chem, 1998)