Novel antigens—anti-alpha-fodrin antibody sensitivity 39.3%, specificity 83.1%; early SD autoantibodies (SP1, anti-salivary protein; CA6, anti-carbonic anhydrase VI; PSP, anti-parotid secretory protein) sensitivity 55.6%, specificity 26.9% Here, SP1 is linked to supranuclear palsy, progressive, 1.