o/context/wall-of-shame/item/633-why-does-the-alzheimers-association-ignore-mercury-as-a-causal-factor-in-alzheimers-diseaseBlood-brain barrier flux of aluminum, manganese, iron and other metals suspected to contribute to metal-induced neurodegeneration <a href="http://www.ncbi.nlm.nih.gov/pubmed/17119290">http://www.ncbi.nlm.nih.gov/pubmed/17119290</a> ???Brain zinc uptake is facilitated by L- and D-histidine, but a transporter, if involved, has not bee