Abbreviation commonly referring to C-reactive protein, a blood test marker for inflammation, or various other organizations and technical terms depending on context.
As an initialism for C-reactive protein, from 'C-reactive' (named for its reaction with C-polysaccharide of pneumococcus bacteria) and 'protein' (Greek 'proteios' meaning 'primary'). Discovered in 1930 and named for its specific bacterial reaction properties.
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