the observation that ixlb and ixla have the same mutation is an unexpected finding , since , on the basis of their ox brain prothrombin time ( pt , a test that measures the ability of the variant factor ix molecules to inhibit the activation of factor x by factor viia-tissue factor complex ) , these variants have been classified into two different groups and were thought to be genetically different .
C0006104
brain
C0039869
thought