preferred_name: K(+)(in) + chloride(in) => K(+)(out) + chloride(out)
preferred_name_lc: k(+)(in) + chloride(in) => k(+)(out) + chloride(out)
label: K(+)(in) + chloride(in) => K(+)(out) + chloride(out)
label_lc: k(+)(in) + chloride(in) => k(+)(out) + chloride(out)