In applying this technique further to formalin-fixed, paraffin-embedded (FFPE) melanoma tissue specimens, we observed similar staining patterns for fucosylated HLA-DRB1 (Fig. 6d,e), which were completely abolished by washing the tissue with l-fuc, confirming specificity for fucosylated HLA-DRB1 (Fig. 6f). The gene discussed is HLA-DRB1; the disease is melanoma.