Recombination signal binding protein for immunoglobulin kappa J region MRNYLKERGD QTVLILHAKV AQKSYGNEKR IKKSKPFSVL ITVQEVRMTM EAVCFKKEEK ETTSLGFFAH LLVYILWAVD GRKKKNKWNA MVVLNKSLNR VHLLG