https://api.elsevier.com/content/article/pii/S1046592821000449doi:10.1016/j.pep.2021.1058611-s2.0-S104659282100044910.1016/j.pep.2021.105861S1046-5928(21)00044-9Expression of SARS-CoV-2 surface glycoprotein fragment 319–640 in E. coli, and its refolding and purification Protein Expression and PurificationJournal104659282021-07-31July 20210falsefalse