Disclosed are split-core carrier substance which, as separate polypeptide, have the core N domain and the core C domain of the core protein of a hepatitis B virus and at least one foreign molecule against which an immune response is to be induced. According to the invention, the foreign molecule, especially the heterologous foreign amino acid sequence, is fused to the C terminus or the core N domain or to the N terminus of the core C domain and the core protein can form capsid-like particles. The invention also relates to the associated production method.
