. Storage of human cell lines in liquid nitrogen, in the initial stage of commercial production of alpha interferon antibodies. The person in background is placing samples of cells into an automatic freezer, prior to their transfer to the storage flasks containing liquid nitrogen (foreground). They are stored at a stable temperature as required, then thawed and multiplied by a fermentation process. The interferons are a family of proteins produced by many cell types which inhibit tumour growth and virus replication. Cell lines used here include NK2 (Natural Killer) and YOK. MODEL RELEASED

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