Mouse Interleukin-13 (IL-13) is produced primarily by activated Th2 cells. IL-13 is a pleiotropic immune regulatory cytokine that promotes growth of human B cells; induces expression of germ line Ce transcripts, directs na?ve B cells to switch to the synthesis of IgE and IgG4, and induces expression of CD23 and Class II-MHC. https://www.creative-bioarray.com/ActoFactor%E2%84%A2-Recombinant-Mouse-Interleukin-13-CSC-CTK0002-item-4204.htm