Scientists announced Wednesday that they had deciphered chromosome 20, the largest of the three chromosomes to be sequenced thus far. Researchers hope that this latest advance by the Human Genome Project will help explain why some people are more susceptible to diseases such as diabetes or obesity. Also the gene that seems to make some a higher risk for Cruetzfeldt--Jakob Disease, the human version of Mad Cow Disease, is found on chromosome 20. The Human Genome Project is an international research effort to map and sequence the human genome. Scientists at The Wellcome Trust Sanger Institute in Cambridge, England completed the sequencing, and their work is published in Nature magazine.