Antithrombin III, also known as Serpin C1, forms a protease inhibitory heterodimer with TMPRSS7. This interaction exemplifies the regulatory role of antithrombin III as a serine protease inhibitor, highlighting its ability to modulate TMPRSS7 activity. Antithrombin III/Serpin C1 Protein, Cynomolgus (HEK293, His) is the recombinant cynomolgus-derived Antithrombin III/Serpin C1 protein, expressed by HEK293 , with C-His labeled tag.