Immunogen sequence: KRKGRCSVPA FCSSQAEAPA DTPEPTAGHT LYSVLSQGYE KLDTPLRPAR QQPTPTSDSS SDSNLTTEED EDRPEVHKPI SGRYE. CD229 (Ly9) is a cell surface receptor of the CD150 family, which includes also e.g. CD48 and CD224. Receptors of this family regulate cyto