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The RNA species SHR1 reacts with biocytin (ε-biotinoyl-L-lysine) in the presence of Ni 2+ or Pt 2+ to produce a metal-bridged complex that migrates more slowly than unreacted RNA in the presence of streptavidin (StrAv) on denaturing polyacrylamide gels. Mapping of reverse transcription pause sites identified G79 as a reactive nucleotide. G79 is near the 3' end of a 37 nucleotide...