There are a number of ELISA Kits available for the measurement of immunoglobulin joining chain, another term for the human protein, joining chain of multimeric IgA and IgM. Other synonyms may include: immunoglobulin J chain, IgJ chain, J chain, immunoglobulin J polypeptide linker protein for immunoglobulin alpha and mu polypeptides, IGJ, and JCH. It is encoded by the JCHAIN gene to yield a protein 159 amino acids in length and 18.1 kDa in size. Versions of immunoglobulin joining chain are present in other organisms, including: Mouse, Rat, Chicken.