Abstract
Two murine lymphomas of spontaneous origin were stored in liquid N2 as cell suspensions in DMSO for 8 and 13 years respectively. Isogenic transplantation assays done some years before freezing and immediately after thawing indicated no measurable loss of clonogenic cells during freezing, storage or thawing; the number of cells required for 50% successful transplantation remained close to unity in both cases. The overall data revealed no evidence of an alteration of the receptivity of the mouse colonies over a period of 13 or 20 years. We attribute this remarkable stability to close supervision of the systems within a single laboratory.
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Selected References
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