Prasa, D Determination of activated factor IX in factor IX concentrates with a chromogenic substrate. [electronic resource] - Thrombosis research Oct 1998 - 99-102 p. digital Publication Type: Journal Article ISSN: 0049-3848 Standard No.: 10.1016/s0049-3848(98)00117-0 doi Subjects--Topical Terms: Biological AssayChromogenic CompoundsFactor IX--analysisFactor IXa--analysisHumans