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. 1998 Aug;117(4):1433–1443. doi: 10.1104/pp.117.4.1433

Figure 6.

Figure 6

The B.t.-toxin-coding region contains elements characteristic of plant-polyadenylation signals. A, Schematic representation comparing the structure of typical plant and mammalian polyadenylation signals. Sequence motifs characteristic of the plant FUE and NUE, as well as the mammalian downstream element (DSE), are indicated. The poly(A+) addition sites are represented by arrows. Plants can use multiple poly(A+) addition sites downstream of specific NUEs within a transcript. The cleavage of a plant transcript usually occurs at a Py/A dinucleotide (YA). Mammalian transcripts are usually cleaved at a single site corresponding to a C/A dinucleotide (CA). B, Identification of elements characteristic of plant polyadenylation signals upstream of the poly(A+) addition sites in the B.t.-toxin-coding region. The putative plant polyadenylation signals in segments 2, 3, and 4 of the B.t.-toxin-coding region were compared with the most commonly used polyadenylation sites in the rbcS-E9 and octopine synthase (OCS) genes. The positions of the FUE and NUE relative to the cleavage site (CS) are indicated.