Mouse Anti- Major latex allergen Hev b 5 Monoclonal antibody for sELISA, WB. Liquid latex from the rubber tree, Hevea brasiliensis, is the source of natural rubber latex (NRL) and contains over 200 proteins; 14 of them have been identified as allergens. Only some allergens retain their allergenic properties through the manufacturing processes. The NRL allergens that have been shown to be clinically relevant to genuine NRL allergy, and present in the final NRL products with maintained allergenicity are Hev b1, Hev b3, Hev b5 and Pro-hevein (Hev b6.02). N-acetyl-D-glucosamine / N-acetyl-D-neuraminic acid binding lectin. Can inhibit fungal growth.