A method for detecting mutated alleles in an excess of wild type alleles in a sample by isolating sample DNA; amplifying a target DNA sequence; and separating mutated DNA sequences from wild type DNA sequences by virtue of the preferential binding of the wild type sequences to carrier-bound complementary oligonucleotides. The card connector can automatically release the ejection prevention mechanism when the card is inserted into the store portion, and can automatically actuate the ejection prevention mechanism after the card is inserted into the store portion. The rotary switching valve further includes a purge gas passage for passing purge gas in a clearance between the valve body and the cylindrical valve member, the purge gas being supplied to the clearance to prevent the main fluid from leaking out of the main passage. If such a Supported Maximum Bitrate does not exist, the Offered Bitrate is selected to be a highest available Supported Maximum Bitrate that is not higher than the Maximum Bitrate Limit. A first subcarrier of the resource block carries data elements.