A protein present in the blood, involved in the body's response to certain kinds of infection.
- ‘Complement properdin increased by 21 percent compared to the placebo group.’
- ‘In addition to evaluating the levels of complement properdin, measurement of other components of the complement system may provide more conclusive evidence on complement system activation.’
- ‘It has developed proprietary monoclonal antibodies to properdin that are potent in vitro and in vivo inhibitors of the complement alternative pathway.’
1950s: from pro- ‘before’ + Latin perdere ‘destroy’ + -in.
We take a look at several popular, though confusing, punctuation marks.