Affinity purified Hippeastrum hybrid lectin (HHL) is consists of four subunits of identical size. It binds only to (Î±-1,3) and (Î±-1,6) linked mannosyl units of Î±-mannose residues. HHL reacts not only with terminal but also with internal Î±-D-mannosyl residues. Lectin appears to possess extended binding sites complementary to at least three 1,6-linked Î±-mannosyl. HHL also binds to some yeast galactomannans. Hippeastrum hybrid Lectin (HHL)Â is labeled with tetramethylrhodamine isothiocyanate (TRITC) and has an appropriate number of fluorochromes bound to provide the optimum staining characteristics for this lectin. TRITC is a bright orange or red-fluorescent dye with excitation ideally suited to the 532-nm laser line. TRITC labeled HHLÂ can be used for cellular imaging applications.