The polypyrimidine tract is a region of messenger RNA (mRNA) that promotes the assembly of the spliceosome, the protein complex specialized for carrying out RNA splicing during the process of post-transcriptional modification. The region is rich with pyrimidine nucleotides, especially uracil, and is usually 15-20 base pairs long, located about 5-40 base pairs before the 3' end of the intron to be spliced.[1]
http://en.wikipedia.org/wiki/Polypyrimidine_tract
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