Affinity purified Hippeastrum hybrid lectin (HHL) is consists of four subunits of identical size. It binds only to (α-1,3) and (α-1,6) linked mannosyl units of α-mannose residues. HHL reacts not only with terminal but also with internal α-D-mannosyl residues. Lectin appears to possess extended binding sites complementary to at least three 1,6-linked α-mannosyl. HHL also binds to some yeast galactomannans.
Hippeastrum hybrid Lectin (HHL) is labeled with fluorescein isothiocyanate (FITC) and has an appropriate number of fluorochromes bound to provide the optimum staining characteristics for this lectin. FITC conjugates have been used in a variety of immunohistochemical and flow cytometry applications.