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The invention refers to a method for producing an antigen comprising at least one hydrophobic or partially hydrophobic antigen molecule from a virus, a bacterium, fungus, protozoan, parasite, a human neoplastic cell or an animal neoplastic, tumor or 5 cancer cell, the method comprising the steps of providing a virus, or cell comprising an antigen molecule, purifying the cell comprising the antigen molecule, solubilizing the antigen molecule in a solubilizing agent that preserves an intact antigen molecule upon solubilization and reconstituting the antigen molecule in a lipid-binding polypeptide that provides a lipid membrane mimicking environment and a reconstituted antigen particle 10 obtained by this method.