preferred_name: Mn(2+)(in) + n H(+)(out) <=> Mn(2+)(out) + n H(+)(in)
preferred_name_lc: mn(2+)(in) + n h(+)(out) <=> mn(2+)(out) + n h(+)(in)
label: Mn(2+)(in) + n H(+)(out) <=> Mn(2+)(out) + n H(+)(in)
label_lc: mn(2+)(in) + n h(+)(out) <=> mn(2+)(out) + n h(+)(in)