TREM2 and Dravet syndrome: To investigate the effect of trisomy-21-related proteins (Aβ42, SOD1, S100β) and iron regulatory proteins (FTL, FPN, hepcidin), as well as inflammatory marker TREM2, on serum levels, a cohort of DS subjects (n = 18) and age-matched controls (n = 18) was analysed by Western blotting.