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EEG features of patients with GRIN2D variants. (A) Proband 2 (Val667Ile) shows multiple spike predominately in bilateral post-lobe (1 year 5 months of age). (B) Proband 6 (Ala678Asp) shows spike and spike-wave in bilateral Rolandic region and mid-line during awake periods (3 years 11 months of age). (C) Proband 7 (Ser1271Leu) shows hypsarrhythmia (3 years).
