Systems, apparatus, and methods for implementing enterprise level social and business information networking are provided. In a preferred embodiment, power rails are formed over a substrate. The hook unit is elastically deformable in a second direction that is opposite to a first direction in which the lid body is fitted to the frame body as the lid body is fitted to the frame body, and then snaps into mating engagement in the engagement recess. The optical member 7 is made of, for example, optical glass or transparent plastic. At higher concentrations, EHop-016 inhibits the close homolog Cdc42. Each toroidal speed change unit includes a pair of input and output disks rotatable about a common rotation axis, the input disks being axially spaced from each other, the output disks being disposed between the input disks and axially opposed to each other in a spaced relation, and a gear set drivingly connected with the output disks.