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Schematic of structure and organization of duck SAA gene. Comparison of the duck SAA cDNA and genomic coding sequences. Exons I, II, and III are 146, 140, and 209 nt, respectively; introns are 720 (5′) and 446 (3′) nt, respectively. B, BamHI; E, EcoRI; P, PstI; and M, MluI.
