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<li>what is poly A[4]? poly A is the long A sequence on the 3' end of mRNA. it is important for mRNA to fully function as genetic code for protein synthesis. there are 3 roles of poly A tail. 1) providing stability to mRNA, 2)recognizing mRNA for exporting from the nucleus or ribosome binding. 3)involving posttranscriptional modification by interacting with PABP(poly A binding protein), maskin, RISC, and so on.</li>

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