1. A227 CTLA-4 DEFICIENCY PRESENTING AS CROHN DISEASE IN A TEENAGE BOY WITH MULTI-SYSTEM INVOLVEMENT : A CASE REPORT. (7th March 2023) Authors: Binomar, H M R; Biggs, C; Yang, C; Amid, A; Schraeder, D; Guttman, O Journal: Journal of the Canadian Association of Gastroenterology Issue: Volume 6(2023)Supplement 1 Page Start: 60 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗