PPP1R15A and transient ischemic attack: When a cutoff value representing the mean s-GADD34-Ab level in HDs plus two standard deviations was used (Alpha count = 2,095), the proportions of individuals with anti-GADD34 antibodies among HDs, patients with TIA, and patients with AIS were 6.5, 13.6, and 18.0%, respectively (Supplementary Table S2).