A work surface is supported by a frame mounted to a front of a vehicle. The oscillating mechanical member further includes a conically-shaped head for cooperating with the orifice and for varying the effective size of the orifice. , cardiopulmonary bypass, dialysis, and angioplasty procedures, in order to reduce or minimize inflammation, excessive bleeding, and other undesirable side effects. The light generation assembly is arranged in the light assembly recess of the light guiding structure such that light emitted by the light generation assembly enters and propagates in the light guiding structure. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention. This can stabilize the moving parts as the shaft is broken, although normally screw threads on the tubular elements will effect the movement of the element.