preferred_name: L-histidyl-glycine(out) <=> L-histidyl-glycine(in)
preferred_name_lc: l-histidyl-glycine(out) <=> l-histidyl-glycine(in)
label: L-histidyl-glycine(out) <=> L-histidyl-glycine(in)
label_lc: l-histidyl-glycine(out) <=> l-histidyl-glycine(in)