Additionally, CHORD uses 1–10 kb and to a lesser extent 10–100 kb duplications (DUP_1e03_1e04_bp and DUP_1e04_1e05_bp, respectively) for distinguishing BRCA1 from BRCA2 deficiency. The gene discussed is BRCA2; the disease is hyperinsulinemic hypoglycemia, familial, 4.