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Cell viability for cells exposed to doxorubicin (DOX), ultrasound (US), and microbubbles (MB) in various combinations. The cells exposed to doxorubicin + US + MB had a statistically significant decrease in cell viability compared with cells exposed to doxorubicin alone or with ultrasound. Each experiment was repeated three times. *P < 0.05 when compared to DOX only treatment group. Bars represent SE.
