The invention relates to oligomers of a dimer, trimer, quatromer or pentamer of recombinant fusion proteins. The oligomers are characterized in that the recombinant fusion proteins have at least one component A and at least one component B, whereby component A contains a protein or a protein segment with a biological function, in particular with a ligand function for antibodies, for soluble or membranous signal molecules, for receptors or an antibody, or an antibody segment, and component B contains a protein or a protein segment which dimerizes or oligomerizes the dimer, trimer, quatromer or pentamer of the recombinant fusion protein, without the action of third-party molecules. The invention also relates to the use of dimers or oligomers of this type for producing a medicament, to the fusion proteins which cluster in dimers or oligomers and to their DNA sequence and expression vectors or host cells comprising this DNA sequence.