This is the ValueSet that contains all the codes in RoleClassMolecularFeatures (http://terminology.hl7.org/ValueSet/v3-RoleClassMolecularFeatures) and RoleClassMolecularFeatures (http://terminology.hl7.org/ValueSet/v3-RoleClassMolecularFeatures). E.g. what you have to deal with if you get resources containing codes in either of them