a 'null ' activity variant for the major liver isozyme of aldehyde oxidase ( aox-1 ) in adult male mice and an electrophoretically distinct , high activity variant of the second liver isozyme ( aox-2 ) were used to examine the segregation of the genetic loci encoding these enzymes ( aox-1 and aox-2 respectively ) in breeding studies .
C0022173
isozyme
C0014442
enzymes