preferred_name: arsenate(out) + H(+)(out) => arsenate(in) + H(+)(in)
preferred_name_lc: arsenate(out) + h(+)(out) => arsenate(in) + h(+)(in)
label: arsenate(out) + H(+)(out) => arsenate(in) + H(+)(in)
label_lc: arsenate(out) + h(+)(out) => arsenate(in) + h(+)(in)