title: A preferred origin and direction of bacteriophage T4 DNA replication. I. A gradient of allele frequencies in crosses between normal and small T4 particles.
mesh_terms: D000483:Alleles; D002499:Centrifugation, Density Gradient; D002875:Chromosomes; D003090:Coliphages; D003433:Crosses, Genetic; D004261:DNA Replication; D004926:Escherichia coli; D005815:Genetic Code; D009154:Mutation