preferred_name: Ca(2+)(in) + 3 Na(+)(out) = Ca(2+)(out) + 3 Na(+)(in)
preferred_name_lc: ca(2+)(in) + 3 na(+)(out) = ca(2+)(out) + 3 na(+)(in)
label: Ca(2+)(in) + 3 Na(+)(out) = Ca(2+)(out) + 3 Na(+)(in)
label_lc: ca(2+)(in) + 3 na(+)(out) = ca(2+)(out) + 3 na(+)(in)