MRC-5 (Medical Research Council cell strain 5) is a diploid human cell culture line composed of fibroblasts derived from lung tissue of a 14 week old aborted caucasian male fetus. The cell line was isolated by J.P. Jacobs and colleagues in September 1966 from the 7th population doubling of the original strain, and MRC-5 cells themselves are known to reach senescence in around 45 population doublings.   
- "MRC-5 (ATCC® CCL-171™)". Retrieved 2016-05-19.
- "AG05965-D Fibroblast from Skin, Lung". Retrieved 2016-05-19.
- Jacobs, J. P.; Jones, C. M.; Baille, J. P. (1970). "Characteristics of a Human Diploid Cell Designated MRC-5". Nature. 227: 168.
- Jacobs, J. P. (1976). "The Status of Human Diploid Cell Strain MRC-5 as an Approved Substrate for the Production of Viral Vaccines". Journal of Biological Standardization. 4: 97–99.
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