title: A purine and pyrimidine requiring mutant of Drosophila melanogaster.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D004331:Drosophila melanogaster; D005804:Genes, Lethal; D007814:Larva; D008967:Molecular Biology; D009154:Mutation; D011687:Purines / Q000378:metabolism*; D011743:Pyrimidines / Q000378:metabolism*
chemical_list: D011687:Purines; D011743:Pyrimidines