To produce quinolinate effectively, a L-aspartate oxidase variant that the feedback regulation by nicotinic acid or NAD is released, and a microorganism including the L-aspartate oxidase variant are provided. The printhead includes a first nozzle group used to print a dot having a first density, and a second nozzle group used to print a dot having a second density. The circuit breaker device is deemed to belong to a first category when the circuit breaker device trips in response to the released energy, and a second category when the circuit breaker device does not trip in response to the released energy.