An isolated polynucleotide comprising a polynucleotide sequence selected from the group consisting ofa) polynucleotide which is at least 70% identical to a polynucleotide that codes for a polypeptide which comprises the amino acid sequence of SEQ ID No. The extractor is capable of rotational and translational motion relative to the slide resulting in improved functioning through an increase in flag distance and reduced friction between the extractor and cartridge when the slide moves into battery. The support frame supports the pair of two turntable assemblies.