Abstract: The application provides polypeptides comprising or essentially consisting of at least one Alphabody, wherein said Alphabody is capable of internalization into a cell and specifically binds to an intracellular target molecule. The application further provides nucleic acids encoding such polypeptides; methods for preparing such polypeptides; host cells expressing or capable of expressing such polypeptides; compositions, and in particular to pharmaceutical compositions, that comprise such polypeptides, nucleic acids and/or host cells; and uses of such polypeptides, nucleic acids, host cells and/or compositions, in particular for prophylactic, therapeutic or diagnostic purposes.