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. 1997 Dec 1;110(6):727–740. doi: 10.1085/jgp.110.6.727

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Representative experiment (of a group of six) of the effect of apical Mg²⁺ on tissue electrical conductance (G) response to basolateral Ca²⁺ removal (−Ca_bl) and reintroduction (+Ca_bl). The urinary bladders were short-circuited and bathed on the apical side by 75 mM KCl and on the basolateral side by NaCl Ringer's solution. During the phase of G increase, the apical solution was replaced by a solution of 55 mM KCl plus 20 mM MgCl₂ (+Mg_ap). Removal of apical Mg²⁺ was obtained by returning to a solution of 75 mM KCl (−Mg_ap).