1 Multiple sclerosis (MS) is a disease that causes demyelination (disruption of the myelin that insulates and protects nerve cells) of spinal nerve and brain cells.  Although the exact case is unknown, multiple sclerosis is considered to be an autoimmune disease.
The skunk is not a rodent. They belong to the family Mephitidae and the order Carnivora which does not include rodentia. They are sometimes placed in the family Mustelidae (weasels) but have been discovered to be less related than was thought.
The oldest skunk fossils are 10 million years old (the end of the Miocene): Pliogale and Martinogale encountered in Kansas. Today, 3 genera are known, all being over 2 million years old (from Pliocene): stripped skunks (Mephitis), spotted skunks (Spilogale) and hog-nosed skunks (Conepatus).