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(Left) Representative current traces through DmCa\textsubscript{v}3 and Ca\textsubscript{v}3.1 measured in 10 mM Ba\textsuperscript{2+} or 10 mM Ca\textsuperscript{2+} elicited by 10 mV step pulses from a holding potential of \textminus90 mV.  Ba\textsuperscript{2+} currents are in black; Ca\textsuperscript{2+} currents are in grey.   (Middle) I-V relationships of DmCa\textsubscript{v}3 ($\fullmoon$}, $\newmoon$) and Ca\textsubscript{v}3.1 ($\square$, $\blacksquare$) in 10 mM Ba\textsuperscript{2+} (open) or 10 mM Ca\textsuperscript{2+} (filled).   (Right) The peak current ratios (I\textsubscript{Ca}/I\textsubscript{Ba}) for DmCa\textsubscript{v}3 and Ca\textsubscript{v}3.1(n=5, 4)  and relative slope conductance (G\textsubscript{MaxCa}/G\textsubscript{MaxBa})(n=6, 4)  in 10 mM Ca\textsuperscript{2+} and 10 mM Ba\textsuperscript{2+}. Student's t-test, ** \emph{p}$<$0.01, *** \emph{p}$<$0.001.  \textbf{(f)} Nickel inhibition sensitivity of DmCa\textsubscript{v}3 and Ca\textsubscript{v}3.1.   (Left) Representative current traces of DmCa\textsubscript{v}3 and Ca\textsubscript{v}3.1 at the indicated Ni\textsuperscript{2+} concentrations.