1. detected at residues 113 and 139 did not These genetic and regulatory factors are
2. exert a primary influence on catalytic func- therefore likely to play a significant role in
3. tion but may affect the stability of mEH the response of individuals to many exoge
4. protein (63). The entire EPHXI gene has nous as well as endogenous compounds.
5. been cloned and sequenced (101). Results Deficiencies of particular enzymes may