?1A) and Cx32?43E1 N2E 219 stop ( Fig.?1B) in bath solutions containing 0, 1.8, and 5?mM MgCl2 from a holding potential of 0?mV. The records shown for each mutation were obtained from the same oocyte after exchange of the external bath solution to change [Mg2+]. In all cases, oocytes were first recorded in 1.8?mM Mg2+ followed by 0 and then 5?mM Mg2+. The results are representative of records obta


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