More recently (April 2007) was found that; Alzheimer's disease, Parkinson's disease, type II diabetes, the human version of mad cow disease and other degenerative diseases are more closely related at the molecular level. An international team of chemists and molecular biologists reported; „A mystery on which the new Nature paper sheds light is what causes different strains of prions (infectious proteins) in which the protein sequence is identical. Our research gives a strong hypothesis that the origin of prion strains is encoded in the packing of the molecules in the fibrils which we are seeing in the crystals…“