“…Whereas the constitutive chromosome number of dogs is 78, the karyotypes of CTVT tumors from Japan, Uganda, Jamaica, France, the United States, Nigeria and Russia all confirmed a chromosome number of 57-59 (Sofuni and Makino, 1963;Weber et al, 1965;Barski and Cornefert-Jensen, 1966;Kakpakova et al, 1968;Thorburn et al, 1968;Murray et al, 1969;Wright et al, 1970;Oshimura et al, 1973;Idowu, 1977;Richardson et al, 1987;Fujinaga et al, 1989). The CTVT karyotype included 15-17 metacentric or submetacentric chromosomes, in contrast to 2 in the normal dog karyotype.…”