“…However, as soon as this constant environment is disturbed, these tissues also respond--usual1y by modulating functions and expressing genes that are not supposed to be modulated or expressed. An example of this phenomenon is the induction of meta110thioneins, the binding proteins which are usually found only in liver and kidney~vivo (Wisniewska~~, 1970;Squibb and Cousins, 1977). Yet, regardless of tissue of origin, cells in culture ++ ++ once exposed to Cd or Zn are capable of producing the protein (Shaikh and Lukis, 1971;Webb and Daniel, 1955;Failla and Cousins, 1978;Rudd and Herschman, 1979;Hildebrand.~~, 1979).…”