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29. Peterson WD Jr, Stulberg CS, Swanborg NK, Robinson AR: Glucose-6-phosphate dehydrogenase isoenzymes in human cell cultures determined by sucrose-agar gel and cellulose acetate zymograms. Proc Soc Exp Biol Med 1968, 128:772–776.PubMed Authors’ contributions LO carried out growth mutagenesis experiments, invasion assays, fluorescence microscopy, protein preparation and analysis, MHö carried out adhesion experiments, RGG and MHe supported LO and MHö in respect to cell culture, adhesion and invasion analysis and fluorescence microscopy, AFM experiments were carried out in cooperation with JR and TES, AB supervised the experiments of LO and MHö and was responsible for the draft and final version of the manuscript. All authors read and approved the final manuscript.