The human prion octarepeat fragment prevents and reverses the inhibitory action of copper in the P2X4 receptor without modifying the zinc action.
Lorca RA, Chac?n M, Barr?a MI, Inestrosa NC, Huidobro-Toro JP. The human prion octarepeat fragment prevents and reverses the inhibitory action of copper in the P2X4 receptor without modifying the zinc action. J Neurochem. 2003 May; 85(3):709-16.