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Scrape attached cells. Cultures can be maintained by addition of fresh medium. Alternatively, cultures can be established by centrifugation with subsequent resuspension at 1 x 10⁵ viable cells/mL. Maintain cultures at a cell concentration between 1 x 10⁵ and 1 x 10⁶ cells/mL. Do not allow the cell concentration to exceed 1 x 10⁶ cells/mL.

Fulton RJ, et al. Purification of ricin A1, A2, and B chains and characterization of their toxicity. J. Biol. Chem. 261: 5314-5319, 1986. PubMed: 3957927

Hay, R. J., Caputo, J. L., and Macy, M. L., Eds. (1992), ATCC Quality Control Methods for Cell Lines. 2nd edition, Published by ATCC.

Caputo, J. L., Biosafety procedures in cell culture. J. Tissue Culture Methods 11:223-227, 1988.

Fleming, D.O., Richardson, J. H., Tulis, J.J. and Vesley, D., (1995) Laboratory Safety: Principles and Practice. Second edition, ASM press, Washington, DC.