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• M199

  Medium 199

• MAB

  Metropolitan Asylums Board, London, UK

• MCB

  Master Cell Bank

• M-CSF

  Macrophage Colony Stimulating Factor

• MEM

  Eagle's Minimum Essential Medium

• MEM (EBSS)

  Eagle's Minimum Essential Medium with Earle's Balanced Salt Solution

• MEM (HBSS)

  Eagle's Minimum Essential Medium with Hank's Balanced Salt Solution

• Mg₂₊

  Magnesium ion

• Microbial Contamination

  When a micro-organism (adventitious agent) is introduced to a cell culture. Includes bacteria, yeast, fungi and mycoplasma. Most contaminants will disrupt the growth or growth conditions of a culture.

• MIGB

  M-iodobenzylguanadine

• Monoclonal Antibody

  An antibody secreted by a hybridoma.

• MRC

  Medical Research Council, Hampstead Laboratories, London, UK

• MRE

  Microbiological Research Establishment, subsequently part of the Health Protection Agency (HPA) based at Porton Down, Salisbury, UK (see also CAMR)

• MRL

  Mycoplasma Reference Laboratory, HPA Centre for Infections, London, UK (until 1976), Norwich, UK

• MRU

  Mycobacterial Reference Unit, PHLS Cardiff, UK

• MWB

  Metropolitan Water Board, London, UK