preferred_name: L-histidine(out) + n H(+)(out) = L-histidine(in) + n H(+)(in)
preferred_name_lc: l-histidine(out) + n h(+)(out) = l-histidine(in) + n h(+)(in)
label: L-histidine(out) + n H(+)(out) = L-histidine(in) + n H(+)(in)
label_lc: l-histidine(out) + n h(+)(out) = l-histidine(in) + n h(+)(in)