Professor Jan-Christer Janson, professor of the Physical and Analytical Chemistry Department in Uppsala University, Sweden, editor of Protein Purification, and an authority in the field of Protein Separation and Purification, came to the Dermatology Department for academic exchanges on "Protein Purification”. More than 40 doctors and postgraduates attended the activity. (Translated by Huang Beier, Proof by Ding Xinyue)