6Kawasaki K, Yokota A, Tomita F. L-Tryptophan production by a pyrucic acid-producing Escherichia coli strain carrying the Enterobacter aerogenes tryptophanase gene. J Ferment Bioeng, 1996, 82(6): 604-606.
7Mateus DMR, Alves SS, Fonseca MMRD. Kinetics of L-tryptophan production from indole and L-serine catalyzed by whole cells with tryptophanase activity. J Biosci Bioeng, 2004, 97(5): 289-293.
8Hatakeyama K, Goto M, Terasawa M, et al. Process for the preparation of L-tryptophan: US, 5776740. 1998-07-07.
9Sambrook J, Fritsch EF, Maniatis T. Molecular Cloning: A Laboratory Manual. 2nd ed. New York: Cold Spring Harbor Laboratory Press, 1989: 908-938.
10Hsiao HY, Wei T, Campell K. Enzymatic production of L-Serine. Biotechnol Bioeng, 1986, 28(6): 857-867.