A modular test switch assembly includes a plurality of stackable features that may be arranged in a variety of configurations. Salient features of the subject micro-organ cultures include the ability to be maintained in culture for relatively long periods of time, as well as the preservation of an organ microarchitecture which facilitates, for example, cell-cell and cell-matrix interactions analogous to those occurring in the source organ. The flag has a home position where the first arm is disposed in the rotational path of the cam and the second arm either blocks the optical path or unblocks the optical path. The device including one or more bone cages can be configured to, andor structured to at least partially or completely surround one or more cells or tissues that produce one or more immunogens andor one or more adjuvants. The formula compound is particularly suitable for using as a component in a black dye composition for ink-jet printing ink, and inkjet printing inks with good light-fastness are obtained.