C3 molecular structural and histopathological analyses in a pediatric case of atypical hemolytic uremic syndrome with life-threatening gastrointestinal bleeding-a case report. - Enya T; Miyazaki K; Kuge S; Morimoto Y; Kondou H; Sakata N; Joh K; Nagano C; Nozu K; Ito N; Hakata Y; Sugimoto K; et al. (Frontiers in pediatrics, 2026)