“…It can be seen (Table IX) (Sirover & Loeb, 1976;Tkeshelashvili et al, 1980), point mutations in bacteria (Venitt & Levy, 1974;Nishioka, 1975;Green et al, 1976;Petrilli & De Flora, 1978b;Lofroth, 1978;Nakamuro et al, 1978;Nestmann et al, 1979;Kada et al, 1980;Kanematsu et al, 1980;De Flora, 1981), yeast (Bonatti et al, 1976) and mammalian cells (Newbold et al, 1-979); and gene conversion (Bonatti et al, 1976) and mitotic reconmbination (Nestmann et al, 1979) in yeasts; chromosomal aberrations (Tsuda & Kato, 1977;Nakamuro et al, 1978;Newbold et al, 1979;Umeda & Nishimura, 1979;Douglas et al, 1980); SCE Majone & Rensi, 1979;MacRae et al, 1979;Douglas et al, 1980); DNA damage Tamino & Peretta, 1980;Douglas et al, 1980;Tamino et al, 1981); DNA repair synthesis ; morphological transformation (Fradkin et al, 1975;Tsuda & Kato, 1977; and enhancement of viral transformation in cultured mammalian cells; increased frequency of micronuclei and chromosomal aberrations in cells of rodents treated in vivo (Wild, 1978) as well as in lymphocytes of professionally exposed workers (Bigaliev et al, 1977). Cr(VI) compounds gave positive results in the mouse "spot" test (Knudsen, 1980) and transformed Syrian hamster cells when injected into pregnant hamsters , thus indicating that they are also transplacental mutagens.…”