An occupation space of a lamp including a mechanism for adjusting a reference position of an optical axis is reduced. The antibodies comprise binding to procalcitonin but not to free calcitonin, free katacalcin and free N-procalcitonin. The display portion has a passive element, and the operation keys have LEDs. WECs of different sizes can be employed to facilitate cancelation of reactive forces and torques. The quantum well is made of AlGaAsSb or GaAsSb, and the barrier layers are made of AlGaAsSb, AlInGaAs, or AlInAs.