Phenol oxidases of a lozenge mutant of Drosophila

Monophenol oxidase (or tyrosinase-A(1)) activity appears to be absent from extracts from pupae of homozygous lozenge-glossy (lz(g)/lz(g)) females and (lz(g)/male symbol) males of Drosophila melanogaster. Diphenol oxidase (tyrosinase-A(2)) activity is less in the mutant extracts than in extracts of wild-type Oregon-R pupae of the same age and sex.