Hussein, Yousif Karim, et al. “The Role of Recombinant DNA Technology in the Production of Insulin and Other Biopharmaceuticals”. American Journal of Botany and Bioengineering, vol. 2, no. 9, Sept. 2025, pp. 76-88, https://biojournals.us/index.php/AJBB/article/view/1459.