Neutrophils in periph. 1025% 5070% blood Lymphocytes in 7590% 3050% periph. blood Serum IgA Mostly polymeric Mostly monomeric Ig classes IgA, IgD, IgE, IgG1, IgG2a*, IgG2b, IgA1, IgA2, IgD, IgG3, IgM * absent in C57BL/6, /10, IgE, IgG1, IgG2, SJL and NOD mice, which have IgG3, IgG4, IgM IgG2c Ig CDR-H3 region Shorter, less diverse Longer, more diverse IL-13 effect on B cells None Induces switch to IgE MHC II expression on Absent Present T cells