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Dry cell weight (DCW) and extracellular α-amylase activity obtained from the cultivation of recombinant B. choshinensis SP3 using (a) different carbon sources (10 g·L−1); (b) different nitrogen sources (10 g·L−1); (c) different amino acids (5 g·L−1); and (d) different proline concentrations. The DCW and enzyme activity represent the averages of three independent measurements. The error bars represent the standard deviation.
