SERPING1 and hereditary angioedema: Activation of the plasma with ellagic acid led to substantial lower levels of enzyme-C1INH complexes in the plasma of patients with HAE-C1INH compared to healthy controls, and these levels remained lower after addition of C1INH (even though the levels of FXIIa-C1INH and FXIa-C1INH increased in patients after addition of C1INH).