MAGEB4 and melanoma: Consistent with their recent origin, most of these genes represented multi-gene families including several predicted immune genes (e.g. Ig lambda chain V-II region MGC, interferons alpha and T-cell receptor beta chain V region LB2), melanoma-associated antigens (MAGEB1, MAGEB3 and MAGEB4) as well as a number of olfactory receptors (Supplementary data 4).