Nucleotide sequences mediating male fertility in plants are described, with DNA molecule and amino acid sequences set forth. In at least one embodiment, the locking device is movable from a release position in which the switch is displaceable in the withdrawable rack to a locking position in which the locking device blocks the switch displacement in a predetermined direction and the actuating shaft is actuated via an actuating crank. The catheter may also include an insertion depth scale to ensure patient comfort and optimum sample quality. Each of the terminals is disposed on one of the 2M electrically conductive portions, respectively, for purpose of connection with an external apparatus.