M protein
M protein may refer to:
- M protein (Streptococcus), a virulence factor of the bacterium Streptococcus pyogenes
- Another name for viral matrix protein, non structural protein linking the viral envelope with the virus capsid
- Another name for paraprotein, an abnormal protein in the urine or blood, often seen in multiple myeloma or MGUS
- Protein M in Mycoplasma genitalium which is different from the above mentioned M protein
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