HYGROMYCIN B AND G418 ANTIBIOTIC RESISTANCE FROM PLASMID PCK 203

A recombinant DNA cloning vector comprising: a) a eukaryotic promoter, b) one or two different structural genes and associated control sequence that convey resistance to either or both antibiotics hygromycin B and G418 when transformed into a host cell that is sensitive to either or both antibiotics for which resistance is conveyed, said host cell being susceptible to transformation, cell division, and culture, and c) a prokaryotic replicon said replicon being functional when said host cell is prokaryotic, subject to the limitations that the one or two structural genes and associated control sequence are adjacent to and, in a eukaryotic host cell, transcribed from the eukaryotic promoter, that a single gene and associated control sequence conveys resistance to either but not both hygromycin B and G418, and that the gene conveying resistance to G418 does not code for the enzyme phosphotransferase.