Zhang, Bing, Bo Yang, Lijun Du, and Yunfen Guo. “Nitric Oxide Donor Andrographolide Enhances Humoral and Cell-Mediated Immune Responses”. Cellular and Molecular Biology 66, no. 3 (June 5, 2020): 176–180. Accessed May 4, 2024. https://www.cellmolbiol.org/index.php/CMB/article/view/3254.