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The expression of GFP integrated in the pseudo attP sites. (A) GFP expression was observed by fluorescence microscopy (right) compared to light images (left, magnification 40×) in fibroblasts 30 days after transfection. (B) FACS quantitation of GFP fluorescence from transgenes integrated at different genomic sites. Non-transfected C. hircus fibroblast cells were used as the control. Color images available online at www.liebertpub.com/dna
