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Pronunciation varies by accent · noun
A preparation of microspheres used as an ultrasound contrast agent.
Use perflutren when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Perflutren means A preparation of microspheres used as an ultrasound contrast agent.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use perflutren where its definition matches the intended context.
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