Disruption of the P2X7 purinoceptor gene abolishes chronic inflammatory and neuropathic pain. by Chessell, I, Hatcher, J, Bountra, C, Michel, A, Hughes, J, Green, P, Egerton, J, Murfin, M, Richardson, J, Peck, W, Grahames, C, Casula, M, Yiangou, Y, Birch, R, Anand, P, Buell, G