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HPRT silenced CHO-K1 cells after electroporation and selection with 6TG. dCTP-electroporated cells after 6TG selection, (a) ×4 magnification with no colonies seen and (b) ×10 magnification with no colonies seen. MedCTP-electroporated cells after 6TG selection, (c) ×4 magnification with several colonies seen and (d) ×10 magnification of one colony. CldCTP-electroporated cells after 6TG selection, (e) ×4 magnification with several colonies seen and (f) ×10 magnification of one colony.
