Wurm, F. M.Johnson, A.Ryll, T.Kohne, C.Scherthan, H.Glaab, F.Lie, Y. S.Petropoulos, C. J.Arathoon, W. R.2007-06-052007-06-052007-06-05199610.1111/j.1749-6632.1996.tb40548.xhttps://infoscience.epfl.ch/handle/20.500.14299/76648659926AnimalsCHO CellsCricetinaeImmunoglobulin G/biosynthesisMethotrexate/pharmacologyReceptorsTumor Necrosis Factor/biosynthesis/geneticsRecombinant Fusion Proteins/biosynthesisRecombinant Proteins/*biosynthesisRetroviridaeTetrahydrofolate Dehydrogenase/biosynthesis/geneticsTransfection/*methodsGene transfer and amplification in CHO cells. Efficient methods for maximizing specific productivity and assessment of genetic consequencestext::journal::journal article::research article