Tu, Zhiming, Guangyuan He, Kexiu X. Li, Mingjie J. Chen, Junli Chang, Ling Chen, Qing Yao, Dongping P. Liu, Huan Ye, Jiantao Shi, and Xuqian Wu. 2005. “An Improved System for Competent Cell Preparation and High Efficiency Plasmid Transformation Using Different Escherichia Coli Strains”. Electronic Journal of Biotechnology 8 (1). Valparaíso, Chile:0-0. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v8n1-8.