One of the major goals of the porcine genome projects is building a physical map. To assign the porcine genes encoding the complement components C6, C7, C8 and C9 to porcine chromosomes, we used a porcine 7000Rad Radiation Hybrid panel (IMpRH) containing 118 clones provided by INRA-University of Minnesota. It resulted in assignment of the porcine C6, C7 and C9 genes to chromosome 16q1.4, the porcine C8A and C8B genes to chromosome 6q3.1-q3.5 as well as the porcine C8G gene lonely to chromosome 1q2.13.