The mark consists of upper case letter "D" followed by lower case letters "i g i" followed by black squares forming the upper case letter "M". The squares consist of eight vertical rows, the first containing six blocks, the second containing eight blocks with the top block tilted off center to the left and the second block being very slightly tilted to the left. The third row contains four blocks; the fourth and fifth rows contain five blocks each; the sixth row contains four blocks, the seventh and eighth rows contain eight blocks each. The square above the first lower case i is tilted off center to the right and contains the image of cells on a slide as seen under microscope. The square above the second lower case i is tilted off center to the left and contains the image of an enlarged cell shown in the form of a circle with a hollow middle as seen on a slide under a microscope.