Soybean also appears to have a highly duplicated genome, with around three quarters of the genes copied in multiple locations. This is the result of genome duplications that took place approximately 59 and 13 million years ago, after which the genome underwent gene diversification and loss and numerous chromosome rearrangements.The genome was sequenced using a whole genome shotgun approach and integrated with physical, high density genetic maps. Soybean is the first legume and the largest plant genome to be sequenced.Most of the sequencing was performed at the Joint Genome Institute in Walnut Creek, California, and the team was led by Scott Jackson from the Department of Agronomy at Purdue University in Indiana, U.S..
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