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