TNFRSF8 and Burkitt lymphoma: Confirming the ELISA results, the Ki-4 scFv displaying phagemid particles bound only to the CD30-positive, Hodgkin-derived cell lines L1236, L540, L428 and KMH-2 and not to the CD30-negative multiple myeloma cell line U266 and the Burkitt Lymphoma cell line BL38.