Song, Ping, and Hwa-Chain Robert Wang. 2004. “Efficient Identification of TetR-Expressing Cell Lines for Tetracycline-Regulated Gene Expression”. Electronic Journal of Biotechnology 7 (2). Valparaíso, Chile:0-0. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v7n2-2.