With eukaryotes, attempts to clone segments of DNA using recombinant DNA technology from warm-blooded vertebrates genomes were to be performed only with vector-host systems that had demonstrably restricted growth capabilities outside the laboratory and in a moderate risk containment facility.
With eukaryotes, attempts to clone DNA segments using recombinant technology from warm-blooded vertebrates' genomes were to be carried out only with vector-host systems that had proven limited growth outside the laboratory and in a moderate-risk containment facility.