tokens: By Southern hybridization analyses of somatic cell hybrid panels with murine cDNA probe , fluorescence chromosomal in situ hybridization ( FISH ) of human genomic clones , and analysis of recombinant inbred mouse strains , we have found single sites for EBF homologous sequences on human Chromosome ( Chr ) 5 , band q34 , and on proximal mouse Chr 11 , in an evolutionarily conserved region .