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Export of tandemly repeated U1 RNAs. (A) Schematic representation of tandemly repeated U1 RNAs. U1 RNA repeated two or three times was named as (U1)x2 or (U1)x3, respectively. (B) A 32P-labeled RNA mixture of U1 ΔSm, (U1)x2 and (U1)x3 RNAs, DHFR mRNA, and U6 Δss RNA was injected and analyzed. (C) Quantitation of three independent experiments carried out as in B.
