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Structure of the Arabidopsis PEPC gene family and Osppc-b gene from rice. Black rectangles, exons; lines, introns. The numbers indicate intron size in nucleotides. Exons and introns in the Arabidopsis genes were deduced by comparing the corresponding cDNA with the gene sequence obtained from the Arabidopsis database (http://www.Arabidopsis.org). The structure of Osppc-b was deduced with the GENSCAN program (http://genes.mit.edu/GENSCAN.html).
