David

I found an article from science daily talking about what I mentioned at the end of class.  The difference between identical twins is the copy number of some genes.  Apparently, it is a fairly common difference.  They proposed it is the reason one twin can get Parkinson’s in some cases and the other doesn’t.  The article has a link to the original study unfortunately, it doesn’t work.  I’ll post it if I find it.

Edit: Here it is.