The graph demonstrates FX levels post infusion of a single dose of 40 IU/kg of high-purity FX concentrate in 2 patients with AL amyloidosis with acquired FX deficiency. Patient 1 (line with squares) and patient 2 (line with triangles) compared with a reference line constructed from FX levels of 3 patients with hereditary FX deficiency reported by Alvarez et al9 given the same concentrate at a dose of 25 IU/kg (line with circles).