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1). Tax Tips For Small Businesses Tax Tips For Small Businesses 2). Alzheimer's Toxin May Be Key To Slowing Disease Australian scientists say they have identified a toxin which plays a key role in the onset of Alzheimer's, raising hope that a drug targeting the toxin could be developed to slow the degenerative brain disease. The toxin, called quinolinic acid, kills nerve cells in the brain, leading to dysfunction and death, the scientists said.