Half of a cell’s nucleus is DNA, the other half involves regulatory proteins that form a type of “sleeve” over the DNA. These protein scan be modified by the environment. Epigenetic “dials” can create more than2,000 variations of proteins from the same gene blueprint, which can alter the gene’s impact. (Lipton, Bruce, PhD. The Biology of Belief. CA: Mountain of Love / Elite Books, 2005, pp 67-70)