An agricultural vehicle includes a cab for an operator of the agricultural vehicle, the cab including a floor, and a utility box mounted beneath the floor for displacement between a storage and an extended position, the utility box including a latch for retaining the utility box in the storage position, the latch being releasable from within the cab. The estrogen receptor gene and the like can be applied to assay systems for evaluating the ability of chemical substances to regulate the estrogen receptor activity. The adjusting ring is rotated to drive the first abutting block and the second abutting block to move close to or away from each other. The next push of MODE ADVANCE will advance the system to: flash traffic control lights, one side red and the other side yellow, next, the complementing red and yellow. The forcedeflection properties of the dynamic bone anchor may be adapted to the anatomy and functional requirements of the patient.