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The cumulative concentration-response curves of gentamicin on single twitch at 0.1 Hz (A) and tetanic fade at 50 Hz for 1.9 s (B). Clindamycin shifts the concentration-response curves to the left. The concentrations of gentamicin are reported as the mean and the SD. CM represents clindamycin. *P < 0.05 for single twitch and †P < 0.05 for tetanic fade, compared with the EC50 for clindamycin 0.0 mM by t-test with Bonferroni's correction.
