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No one factor is the cause. It is believed to be partly genetic, partly environmental, partly viral or bacterial.

And... pregnancy in women lead to the disappearance, usually, of symptoms. Progesterone or some hormone in women can greatly affect the symptoms.

Still, the cause or causes of MS remain elusive.

Dawn, check out my earlier post. Also the FOX news site has some more on MS. It is under the health section, then click on neurology on the sidebar.

And... pregnancy in women lead to the disappearance, usually, of symptoms. Progesterone or some hormone in women can greatly affect the symptoms.

It's been recognized for quite a while that the symptoms of autoimmune diseases decrease during pregnancy.

Here's one of the stardard ways to draw images of vitamin D and two steroid hormone molecules in Organic Chemistry. The vertices in these drawings represent carbon atoms in single or double covalent bonds. Double bonds share two pairs of electrons and are indicated by a pair of parallel lines. Single covalent bonds of carbon to hydrogen at the vertices is assumed as the convention. C represents carbon, O represents oxygen and H represents hydrogen.

In the second drawing, C₂₃H₂₈O₆ is another way to describe the molecule which has a molecular wieght of 400.47 units, of average atomic wieght units when the average weight and distribution of isotopes are included. The subscripts indicate the total number of each elements number of atoms in the molecule.

vitamin D₃ from http://bioe.eng.utoledo.edu/adms_staffs/akkus/2003_WEB_PROJECTS/hormone/vitamin_d.htm

prednisone from http://img.alibaba.com/photo/50457579/Prednisone_Acetate.jpg

from http://www-klinik.uni-mainz.de/Zentrallabor/Lab-Web/Hypertextbook/cortisol.gif