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Effects of NSS and AU extracts on H9c2 cell viability. NSS and AU extracts (50 µg/mL) were administered alone for 24 h or 4 h before doxo (1 µM). Cellular viability was assessed by MTT assay. Data are reported as mean ± SD of three independent experiments (N = 6). Statistical analysis was performed by analysis of variance test (ANOVA), and multiple comparisons were made by Bonferroni’s test. ** p < 0.005 vs. ctrl; °° p < 0.005 and °°° p < 0.001 vs. doxo.
