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The frequency of alterations in disease genes is variable in multi-factorial disorders , potentially making them difficult to identify . In seasonally dry areas , spotted knapweed 's taproot allows it to access water from deep in the soil , beyond the reach of more shallowly rooted species . Featured will be dances and songs that were popular in courtly gatherings from the Timurid , Safavid and Qajar periods , and songs and dances of the colorful regional traditions of the Iranian world . " It creates a culture of giving , something that I think is deeply embedded in Johns Hopkins and the people who work here . As the NYT article above points out that derivative financial instruments are increasingly popular in world commerce . Nine were ultimately returned to the wild in Monterey Bay in the summer of 2004 .