Yes, opsonins is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
opsonins
Noun
1. An antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
What Scrabble words can I make with the letters in opsonins?
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