An apparatus for determining a diagnostic glucose level in a human subject includes a light source that produces collimated light at a selected wavelength. The method is effected by transplanting into the subject tissue derived from a human or porcine, kidney or liver, the kidney or liver being at a selected gestational stage. The approach also involves determining that the device is in a locked state. , and final aging the aluminum alloy at a temperature of not greater than about 225\xb0 F. The projected image is configured to highlight the fixed region. The ultraviolet-type seal is pre-cured by the ultraviolet light from the first substrate direction to the seal, and then cured by a heating process.