preferred_name: D-serine(out) + H(+)(out) = D-serine(in) + H(+)(in)
preferred_name_lc: d-serine(out) + h(+)(out) = d-serine(in) + h(+)(in)
label: D-serine(out) + H(+)(out) = D-serine(in) + H(+)(in)
label_lc: d-serine(out) + h(+)(out) = d-serine(in) + h(+)(in)