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Schematic representation of a twintron. In most cases a set of splicing sites for a one type of spliceosome is nested in a set of splicing signals of another type of spliceosome (major cartoon). However, in a number of cases the splicing signals of the two spliceosomes are shifted, i.e. both 5′ and 3′ splicing signals of one spliceosome lay upstream of splicing singlas of another spliceosome (imbedded cartoon).
