A desorber for use with a chemical ionisation mass spectrometer comprises a body portion that has a cavity formed therein, the cavity being arranged to receive a sample collector, the sample collector being preferably carried by a holding device that can be slid in and out of the cavity. The stent also has a length to bridge a distance between a first end of the urological structure and a second end of the urological structure. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 79-93 RZ. When the lockout device is in the open position, the actuator carriage is movable, and, when the lockout device is in the closed position, movement of the actuator carriage is blocked by the lockout device such that the actuator carriage cannot be moved from the rest position to the actuated position.