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Fig. 3. Transcriptional activation is associated with a severalfold increase in transgene array volume. GFP/lac-repressor signals from transgene arrays in PALZ39E cells from an inducible culture. Projections of confocal image stacks are shown. (A) Uninduced X-Gal-negative cells. (B) Induced X-Gal-positive cells. DNA counterstain in blue. Scale bar is for all images.