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We have tested conditions for the labeling and tailing the 3'-end of RNAs with yeast poly(A) polymerase. Conditions were optimized for addition of NTP, dNTP, or ddNTP nucleotides to RNA. ATP, GTP, and UTP were useful for adding homopolymer tracts of various lengths. The nonradioactive nucleotides biotin-N6-ATP and digoxigenin-11-UTP also were used efficiently.
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Martín et al. (1998) studied this question.