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Sequence features of a consensus Alu element. The left arm harbors the internal Pol III promoter, composed of the A Box and B Box. The right arm has a 31-bp insertion. The two arms are separated by an A-rich region and the entire Alu element ends with a poly(A) tail. Grey indicates the genomic repeats that originate from the retrotransposition event and the 3′ trailer sequence between the poly(A) tail and the canonical terminator (at least four Ts).
