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The effects of 22R and its deleted sequences on GFP gene expression. (A) Nucleotide sequences of double tandems of 16R, 17ntAT, 19R, 22R and single 17ntAT. The nucleotides linking two fragments are underlined. (B) 22R and its deleted sequences were inserted downstream of the GFP gene in pAlu14. HeLa cells were transfected with the expression vectors and GFP RNA was detected by northern blotting.
