Duangporn Ungsupravate และ Kanoktip Packdibamrung. (2006) Construction of alanine racemase gene knockout mutants of Escherichia coli BL21(DE3) by using a group II intron. Chulalongkorn University:ม.ป.ท.Duangporn Ungsupravate และ Kanoktip Packdibamrung. 2006. Construction of alanine racemase gene knockout mutants of Escherichia coli BL21(DE3) by using a group II intron. ม.ป.ท.:Chulalongkorn University;Duangporn Ungsupravate และ Kanoktip Packdibamrung. Construction of alanine racemase gene knockout mutants of Escherichia coli BL21(DE3) by using a group II intron. ม.ป.ท.:Chulalongkorn University, 2006. Print.