preferred_name: LDLR:LDL complex => LDLR + LDL (Rattus norvegicus)
preferred_name_lc: ldlr:ldl complex => ldlr + ldl (rattus norvegicus)
label: LDLR:LDL complex => LDLR + LDL (Rattus norvegicus)
label_lc: ldlr:ldl complex => ldlr + ldl (rattus norvegicus)