Norharman becomes mutagenic with the addition of aniline or its metabolite phenylhy-droxylamine. National Cancer Center Research Institute. Endogenous occuring beta-carboline (norharman) induces parkinsonism in nonprimate animals: a possible causative protoxin in idiopathic Parkinson's disease - Pub Med. Rescue of mesencephalic dopamine neurons by anticancer drug cytosine arabinoside - Pub Med A combined evaluation of biochemical and morphological changes during human neuroblastoma cell differentiation - Pub Med. The effects of retinoic acid and cytosine arabinoside on the human neuroblastoma. Cell proliferation rate was reduced by retinoic acid and cytosine arabinoside. Acetylcholinesterase activity was significantly stimulated by retinoic acid. (It inhibits acetylcholine and tremors). Retinoid X mutant mice have parkinsonian locomotion - pub med. Targretin is a cancer drug, a retinoid X agonist, booster, on trial now for skin cancer. Also, I think N-Methyl is the environmental cause of Parkinsons. If it is, it would bind with P-glycoprotein and be carried across the blood brain barrier. P-glycoproteins bind with NIH3T3 fibroblast cells that would increase RAS, the oncogene involved in Cancer, and the NIH3T3 fibroblast cells would also increase or activate the MAP Cascade and p38-MAP. MAP1 and MAP2 are part of lewy bodies. MAG or myelin associated glycoprotein is associated with Trembler mice. Just a theory though. But it seems likely that Parkinsons and Cancer are very much alike. I wish someone would try Targretin on Parkinsons disease.