RAD51 and neoplasm: Finally, we observed a third group of animals which displayed intermediate tumor multiplicity between that of the two parental extremes (X = 8.5; p<0.001 for either comparison); these included RecA x B6 (genotype BB proximal/AB distal; genotype AB proximal/AB distal), RecB X B6 (AB proximal, AB distal), RecB X A (AA proximal/AB distal), and RecC X A (AB proximal, AB distal).