Effect of Ca2+ and calcium channel blockers on [3H]taurine uptake by TR-TBT cells. [3H]Taurine (28 nM) uptake was performed at 37°C for 5 min in ECF buffer in the absence or the presence of 2.8 mM calcium ion, 1 mM nickel chloride, 0.3 mM cadmium chloride, 0.3 mM verapamil, 2 mM nifedipine and 2 mM nimodipine in TR-TBT 18d-1 cells (open bar) and TR-TBT 18d-2 cells (shaded bar). Under Ca2+ free condition, Ca2+ was replaced Mg2+. Each value represents the mean ± SEM (n=3-4). * p<0.05, ** p<0.01 significantly different control.