A drive for coupling an engine starter to an engine includes a drive portion including a screw shaft, and a clutch portion including a clutch body, wherein the clutch body is integrated with the screw shaft. The reference cell includes an NDR device, a gate-like device disposed adjacent to the NDR device, a first resistive element coupled between the NDR device and the bit line, and a second resistive element coupled between a sink and the bit line. A passivation layer is formed over the substrate and intermediate conduction layer. The optical fiber is received in the through hole of the optical ferrule. In one embodiment, the variable regions of these antibodies or polypeptides comprising them can be used to treat disorders, such as cancer.