The interspecies comparison that has to bemade suers from two diculties.First, in human organs large interindividual variations exist between individual cytochrome P450 enzymes (Guengerich and Turvey 1991, Forrester et al. 1992, Lucas et al. 1993, Shimida et al. 1994, Bogaards et al. 1995), as a consequence of phenotypic di
erences of genetic polymorphisms (Cholerton et al. 1992,Daly et al. 1993,Nakachi et al. 1993,
Furuya et al. 1995, Daniel and Edeki 1996). Second, although cytochrome P450 enzymes are classified into distinct subfamilies based on amino acid sequence identity (Nelson et al. 1993), a high degree of sequence identity does not
automatically mean similar catalytic specicity (Guengerich 1997).
The interspecies comparison that has to bemade suers from two diculties.First, in human organs large interindividual variations exist between individual cytochrome P450 enzymes (Guengerich and Turvey 1991, Forrester et al. 1992, Lucas et al. 1993, Shimida et al. 1994, Bogaards et al. 1995), as a consequence of phenotypic dierences of genetic polymorphisms (Cholerton et al. 1992,Daly et al. 1993,Nakachi et al. 1993,Furuya et al. 1995, Daniel and Edeki 1996). Second, although cytochrome P450 enzymes are classified into distinct subfamilies based on amino acid sequence identity (Nelson et al. 1993), a high degree of sequence identity does notautomatically mean similar catalytic specicity (Guengerich 1997).
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