The present invention relates to a filamentous phage display method wherein the polypeptides of interest displayed on the phage particle are cotranslationally translocated across the cytoplasmic membrane of Gram-negative bacteria based on the signal recognition particle pathway. The spinal implant includes an upper and lower surface adapted to engage cancellous bone tissue in the vertebral bodies. In some examples, a robotic device may be configured to receive a second device, such as a mobile phone, that may be configured to function as necessary as an accessory or a \u201cbrain\u201d of the robotic device. The paper feeding module includes a photoreceptor axle, a transferring axle and a skew correction axle. The housing has an undocked position and a docked position wherein the housing is secured to a receiving station associated with the marking machine. The radius of the through hole is larger than that of the rotating shaft.