title: Neighbor effects in the mutation of ochre triplets in the T 4 rII gene.
mesh_terms: D003090:Coliphages; D004279:DNA, Viral; D005815:Genetic Code; D009154:Mutation / Q000187:drug effects; D011687:Purines / Q000494:pharmacology
chemical_list: D004279:DNA, Viral; D011687:Purines