The present invention relates to polynucleotides corresponding to the lysR3 gene and which encode a LysR3 transcriptional regulator, methods of producing L-amino acids, and methods of screening for polynucleotides which encode proteins having LysR3 transcriptional regulator activity. A first source electrode and a first drain electrode formed across a first gate electrode make an ohmic contact to the second semiconductor layer. A disk has a disk surface on rollers provided on the top surface of the turntable and a ring-shaped detected part located around an outer circumference of the disk surface and projecting from the under surface of the disk. The multiplexer outputs one of the bitstream signals in response to a frequency deviation control signal. This eliminates the need for a loose cord or bead chain that would traditionally be used as the user interface for controlling the movement of the slats of the blind. The RAIL system could create a servo pattern of a recording-head trajectory of a hard disk drive in a master for magnetic-contact printing.