Howells Howells DW DW Porritt Porritt MJ MJ Wong Wong JY JY Batchelor Batchelor PE PE Kalnins Kalnins R R Hughes Hughes AJ AJ et al et al Reduced BDNF mRNA expression in the Parkinson’s disease substantia nigra Reduced BDNF mRNA expression in the Parkinson’s disease substantia nigra Exp Neurol Exp Neurol 2000 2000 166 166 1 1 127 127 135 135 11031089 11031089. Here, BDNF is linked to Parkinson disease.