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GFP expression in immature embryos of barley cv. Golden Promise 48 h after biolistic transformation with (a) pGY1‐pH vU3: GFP , containing 638 bp of the promoter sequence upstream of the coding region of the U3 snRNA promoter from barley, and (b) pGY1‐pO sU3: GFP , containing 380 bp of the promoter sequence upstream of the coding region of the U3 snRNA from rice, to drive GFP expression. Arrows mark GFP fluorescence. Bar scale 0.5 mm.
