Positive Samples: Mouse spleen, Rat spleen Immunogen sequence: MTCSPLLLTL LIHCTGSWAQ SVLTQPPSVS AAPGQKVTIS CSGSSSNIGN NYVSWYQQLP GTAPKLLIYD NNKRPSGIPD RFSGSKSGTS ATLGITGLQT GDEADYYCGT WDSSLSA. Immunoglobulin classes share the same basic four polypeptide