Disclosed herein are generally to methods and systems that facilitate imaging of cells on a substrate and more particularly to pre-implantation and post-implantation imaging of cell-seeded substrates implanted in target tissues in the context of stem cell therapy. The evaporated fuel system diagnostic apparatus includes a malfunction determination unit which determines whether a malfunction occurs in an evaporated fuel system, by introducing a negative pressure of an intake passage into a fuel tank. The optical interface assembly converts optical signals into electrical signals and electrical signals into optical signals. Based on the determined status, the APC is processed on the UMS thread. The second portion of the label identifies the actual contents of the vial, along with instructions in case of an adverse reaction, but all of which is concealed by an scratch-off, opaque layer.