Problematically, though, viruses can
mutate new symptoms on their own, and indeed some of the plagues that you can choose when creating a new game have incredibly rapid evolutions that can leave you floundering.
The condition is more common than muscular dystrophy and cystic fibrosis, but the development of
new therapeutic concepts is hindered by the fact that unlike muscular dystrophy and cystic fibrosis, where a single
mutated gene causing the disease is known, the entire human chromosome 21 (containing around 300 genes) still has to be dissected into individual gene - dose contributions to the DS
symptoms.