A positive displacement rotary system may include a main rotor and a slotted rotor. In accordance with preferred embodiments, oligonucleotides are provided which are specifically hybridizable with nucleic acids encoding B7 proteins. At such high resolutions diffraction effects can start to dominate and can degrade image quality. The gathering portion 14 forms the optical fiber ribbons 11 sent out of the stationary ribbon supply unit 9 into a cable core 15 by holding the optical fiber ribbons 11 within the spiral groove of the spacer 2 sent out of the spacer paying-out portion 7 and running forward while rotating on its center axis.