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Conditioned media from cultured cells have long been used to increase the cloning efficiency, growth rate and antibody secretion of hybridomas. The potential sources of conditioned media include cultured splenocytes, peritoneal macrophages, and macrophage, endothelial or fibroblast cell lines. The conditioned media from these cultures contain a variety of cytokines that act as growth factors for hybridomas. However, the constituents of conditioned media are largely undefined. Conditioned media may contain cell metabolites, cellular contaminants, and other undefined components that may interfere with the bio-analysis of hybridoma-derived antibodies.