M protein

noun
\ ˈem- How to pronounce M protein (audio) \

Medical Definition of M protein

1 : an antigenic protein of Group A streptococci that is found on the cell wall extending into the surrounding capsule, is variable among the different serotypes, and confers streptococcal virulence by protecting the cell from phagocytotic action

called also M substance

2 : a monoclonal antibody that is produced by plasma cells abnormally proliferating from a single clone and that is characteristic of monoclonal gammopathy

Learn More About M protein

Dictionary Entries Near M protein

MPF

MPH

M phase

M protein

MPTP

mR

MR

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Cite this Entry

“M protein.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/M%20protein. Accessed 16 Jun. 2021.

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