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Voltage-dependent L-type Ca2+ channels form highly selective pores for Ca2+ ions in the membranes of excitable cells. We investigated the functional role of negatively charged residues, within or near the selectivity region, in ion permeation of a human cardiac L-type Ca2+ channel. Glutamates in each of the four repeats, and an aspartate in repeat IV, were substituted with positively charged lysine...
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