RNASE1 and plasma cell myeloma: Fusion of popliteal lymph node cells, from mice immunized with DENV2 rNS1, with a non-Ig-secreting or synthesizing line derived from a cell line created by fusing a BALB/c mouse spleen cell and the mouse myeloma P3X63Ag8 (SP2/O-Ag14) mouse myeloma cells, generated 25 secretory hybridomas.