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Soybean has experienced multiple genome duplications in its evolutionary past as evidenced by cytogenetic analysis,RFLP genetic linkage map,and divergence analysis of paired EST sequences.To shed light on the nature and timing of these duplication events,we have been recently characterizing centromeric components and sequencing a number of large duplicated regions of soybean.We have found two centromeric satellite sequences that mark subsets of chromosomes by FISH.