Abstract
An electrophoretic polymorphism of the peroxisomal enzyme d-amino acid oxidase was observed in NZC strain Mus musculus. F1 (NZC × BALB/c) mice showed a codominant allele two-banded phenotype which is inconsistent with the dimeric subunit structure reported for this enzyme in other species. The enzyme locus (Dao) was shown to segregate independently of Hao-1, encoding the peroxisomal enzyme hydroxyacid oxidase (liver or A4 isozyme). Thus Dao is not linked to previously mapped peroxisomal enzyme loci, Hao-1 and Cs, closely localized on chromosome 2.