“…Several studies previously reported that structural chromosomal aberrations in cultured lymphocytes were significantly more frequent in styrene-exposed workers [Meretoja et al, 1977[Meretoja et al, , 1978Fleig and Thiess, 1978;Hogstedt et al, 1979;Sorsa et al, 1979;Anderson et al, 1980;Camurri et al, 1982;Thiess et al, 1980, 19821. However, other data indicated no such increase Thiess and Fleig, 1978;grim, 1981;Watanabe et al, 1981;BrBgger, 19821. Perusal of such reports suggested a possible dose dependency in the effect so that the effects are positive only when the exposure is above a certain critical intensity [Watanabe et al, 19811.…”