A method for loading an integrated circuit FIFO at extremely high operating frequencies includes providing N logical locations, providing N1 transparent latch stages, and providing N1 write pointers, wherein two write pointers are contemporaneously enabled during a FIFO load operation. The camera controller is configured to detect the visual token and reconfigure the field of view relative to a detected position of the visual token. The override unit is provided with a light source, such as an LED, to emit light to actuate the light sensor of the occupancy sensor, thereby controlling the occupancy sensor, such as by preventing the occupancy sensor from being actuated. Diagnostic methods and kits may employ an agent suitable for detecting alterations in endogenous genes involved in sphingolipid metabolism.