title: The dominance of exrB over exrB+ in heterodiploids of Escherichia coli.
mesh_terms: D002455:Cell Division; D003433:Crosses, Genetic; D004171:Diploidy; D004926:Escherichia coli / Q000378:metabolism / Q000528:radiation effects*; D005799:Genes, Dominant; D006238:Haploidy; D009154:Mutation; D011830:Radiation Effects; D014161:Transduction, Genetic; D014466:Ultraviolet Rays