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Measurement of the lengths of oligo(A) and poly(A) stretches found in the 3′ tails of RNAs from E. coli DH5α (lane 2) and B. halodurans C-125 (lane 3). Lane 1 contains an oligo(dT)18 size standard. Labeled 3′ tails were fractionated on a 12% denaturing polyacrylamide gel.
