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Two-dimensional gel electrophoresis of COS-7 proteins in the absence or presence of masking or control oligonucleotides. Proteins were electrophoresed from COS-7 cells that were either untransfected (A) or transfected (B) with 1 μm Gtx oligonucleotide (oligo). The arrows in A are spots that were subjected to mass spectrometry and correspond to vimentin (upper arrow) and stomatin (lower arrow).
