The cysteine protease (CP) EhCP-B9 is highly involved in the virulence of Entamoeba histolytica, a protozoan parasite that causes amoebiasis. Together with EhADH112 adhesin, EhCP-B9 forms a
112 kDa complex (EhCPADH112). EhCP-B9 was first identified using monoclonal antibodies and virulence-deficient mutants