The multicellular (as opposed to the monoclonal) origin of the murine myeloma cell.
D000818:Animals; D002459:Cell Fusion; D002471:Cell Transformation, Neoplastic; D006822:Hybrid Cells; D008264:Macrophages; D051379:Mice; D008807:Mice, Inbred BALB C; D009101:Multiple Myeloma / Q000276:immunology; D009374:Neoplasms, Experimental; D010950:Plasma Cells; D012190:Retroviridae