The present invention provides methods for identification of methylated, andor potentially methylatable CpG dinucleotides in genomic DNA sequences, and methods for isolating genomic DNA sequences comprising methylated CpG dinucleotide sequences. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. A reference level setting portion 8 holds the level of the state monitoring signal at which an optimum recording state is obtained and outputs a reference level signal. Therefore, the set operation can be performed rapidly without being easily influenced by an intersection capacitance and a wiring resistance which are parasitic on a wiring and the like. The cut out area may be a size that allows the shim to pass through. protocol information, can be appended to the PAB.