preferred_name: Ca(2+)(out) + n H(+)(in) => Ca(2+)(in) + n H(+)(out)
preferred_name_lc: ca(2+)(out) + n h(+)(in) => ca(2+)(in) + n h(+)(out)
label: Ca(2+)(out) + n H(+)(in) => Ca(2+)(in) + n H(+)(out)
label_lc: ca(2+)(out) + n h(+)(in) => ca(2+)(in) + n h(+)(out)