Memristors - the fourth fundamental two-terminal circuit element following the resistor, the capacitor, and the inductor - have attracted intensive attention owing to their potential applications for instance in nanoelectronic memories, computer logic, or neuromorphic computer architectures. Scientists have been able to show that various materials such as metal oxides, chalcogenides, amorphous silicon, carbon, and polymer-nanoparticle composite materials exhibit memristive phenomena. One unanswered question so far has been whether natural biomaterials like proteins can be used for the fabrication of solid-state devices with transport junctions. Researchers in Singapore have now demonstrated that proteins indeed can be used to fabricate bipolar memristive nanodevices.