Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed In all cells of our body the blueprint and the respective operation instruction are stored. The information center is in the cell nucleus. The 23 chromosome pairs consist of the material that carries the entire genetic information of a person -- the so called DNA. Each chromosome is made up of one huge single coiled DNA molecule. The DNA is designed like a twisted rope-ladder. The sequence of the four letters (A for adenine, T for thymine, G for guanine and C for cytosine) defines the genetic code. A is always paired with T and C with G. These 3 billion building blocks have now been decoded by the human genome project. Things are different however with genes -- if one knows their function. They are responsible for instance for determining if we are small or tall or if we have blue or green eyes. Only 3 to 5% of the human genetic material are genes, though. Somewhere on the spirally twisted rope ladder they are hidden between the 3 billion building blocks. Genes can consist of short or long chains of letters. How many of them there are -- nobody knows. Estimates are between 30 and 140 thousand genes. To obtain a gene patent, among other things a commercial application must be disclosed.