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The content and percentage of 16 free amino acids in the anthers of the control and amidosulfuron treatment. Error bars represent ± one standard deviation (n = 3). * and ** symbols indicate the value is significant at 90 and 95% confidential level, respectively. (A) The sum of 16 amino acids and the content of four most abundant amino acids. (B) The content of three branched-chain amino acids and the others. (C) The percentage of 16 amino acids in the total free amino acids pool.
