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Anthocyanin contents of transgenic tobacco plants carrying NtbHLH1 gene. (A) Flower color comparison between wild type (WT) and transgenic lines (1–3, 1–4 and 1–7). (B) Anthocyanin contents. (C) Total flavonoid contents. The bars represent the standard error of thrice biological replication. Small letters showed a significant difference at the level of p < 0.05 by using SPSS statistical analysis
