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