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Group II introns are ribozymes occurring in genes of plants, fungi, lower eukaryotes, and bacteria. These large RNA molecular machines, ranging in length from 400 to 2500 nucleotides, are able to catalyze their own excision from pre-mRNA, as well as to reinsert themselves into RNA or sometimes even DNA. The intronic domain 1 contains two sequences (exon binding sites 1 and 2, EBS1 and EBS2) that pair...
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