10 Dalakas Dalakas MC MC Li Li M M Fujii Fujii M M Jacobowitz Jacobowitz DM DM Stiff person syndrome: quantification, specificity and intrathecal synthesis of GAD65 antibodies Stiff person syndrome: quantification, specificity and intrathecal synthesis of GAD65 antibodies Neurology. This evidence concerns the gene GAD2 and stiff-person syndrome.