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