title: T3 times T7 phage crosses leading to recombinant RNA polymerases.
mesh_terms: D003090:Coliphages / Q000378:metabolism*; D003433:Crosses, Genetic; D004267:DNA Viruses / Q000378:metabolism; D004279:DNA, Viral; D012321:DNA-Directed RNA Polymerases / Q000096:biosynthesis* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism; D005796:Genes; D008970:Molecular Weight; D014176:Protein Biosynthesis; D011995:Recombination, Genetic; D013698:Templates, Genetic
chemical_list: D004279:DNA, Viral; D012321:DNA-Directed RNA Polymerases