Abstract: The invention relates to an improved method for the selection of hybridoma cells from a plurality of hybridoma cells for the generation of monoclonal antibodies as well as hybridoma cells together with suitable expression vectors by means of intracellular biotinylation and the use thereof.

Abstract: The invention relates, firstly, to a biomolecule-releasing cell characterised by a surface protein with an extracellularly exposed ligation peptide sequence for enzymatic conjugation of an adapter ligand, said adapter ligand being suitable for the indirect or direct coupling of a molecular catcher structure which has at least one specific binding site for the released biomolecules and which is at a distance from the specific binding site, secondly, to a method for selecting such a cell, and thirdly, to a means for this method comprising the surface protein that is characterised by an extracellularly exposable ligation peptide sequence for enzymatic conjugation of an adapter ligand, a nucleic acid coding for the surface protein, an expression vector for the nucleic acid, and a cell containing the expression vector.

Abstract: The invention relates to a method for producing polyclonal antibodies against an antigenic target protein which comprises inducing an immune response in a host by applying an immunogenic composition comprising membrane vesicles incorporating said antigenic target protein to said host and obtaining antibodies against said target protein from the host's serum.

Abstract: The invention relates, firstly, to a biomolecule-releasing cell characterised by a surface protein with an extracellularly exposed ligation peptide sequence for enzymatic conjugation of an adapter ligand, said adapter ligand being suitable for the indirect or direct coupling of a molecular catcher structure which has at least one specific binding site for the released biomolecules and which is at a distance from the specific binding site, secondly, to a method for selecting such a cell, and thirdly, to a means for this method comprising the surface protein that is characterised by an extracellularly exposable ligation peptide sequence for enzymatic conjugation of an adapter ligand, a nucleic acid coding for the surface protein, an expression vector for the nucleic acid, and a cell containing the expression vector.

Abstract: The invention relates to a method for producing polyclonal antibodies against an antigenic target protein which comprises inducing an immune response in a host by applying an immunogenic composition comprising membrane vesicles incorporating said antigenic target protein to said host and obtaining antibodies against said target protein from the host's serum.