A nucleic acid sequence encoding Mammastatin, a specific mammary cell growth inhibitor. The faceplate includes a transparent viewing layer, a transparent conductive layer formed on the transparent viewing layer and intersecting stripes of light-absorbing, opaque insulating material formed on the transparent conductive layer. The upper and lower terminals are respectively received in the upper and lower passageways. The sequence number transmitted during the interval is compared with the intrinsic sequence number transmitted during the first stage.