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Positional cloning of the SOS2 gene. (A) Physical mapping of SOS2. Genetic mapping delimited SOS2 to a region in the BAC clone K21B8. The SOS2 gene was identified by sequencing candidate genes in this region from sos2 mutant and wild-type plants. (B) Structure of SOS2 and position of sos2 mutations. Positions are relative to the initiation codon. Filled boxes indicate the ORF, and lines between boxes indicate introns.
