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The mouse potassium channel Kir2.3 possesses conserved extracellular cysteine residues at positions 113 and 145. We have investigated the role of these cysteines in structure/function and membrane trafficking. Cysteine to serine mutations resulted in the absence of potassium currents in oocytes and co-expression of these mutants with wild-type channel showed a dominant negative inhibition of wild-type...
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