in sera from patients with hereditary angio-oedema who lack the alpha ( 2 ) -glycoglobulin c1 inhibitor , silicates and other potent activators of clotting factor xii induced far less c1 esterase activity than did the weaker factor xii activators , carrageenin and cellulose sulphate .
C0019243
hereditary
C2366367
c1 inhibitor