Serine protease inhibitor that inhibits clotting factor G and to a lesser extent proclotting enzyme and clotting factor C. Monomer (PubMed:8798603). Forms a covalent heterodimer with clotting factor G subunit beta chain B (PubMed:8798603). Localizes in the large granules of hemocytes (By similarity). Secreted in hemolymph in response to external stimuli (By similarity). Specifically expressed in hemocytes (at protein level). N-glycosylated. Belongs to the serpin family.