Vol. 57, No. 14, 2006, pp. 3601–3618. The name and affiliation of the fifth author were incorrect. They should be: Hanhong Bae, US Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Beltsville, MD 20705, USA. The authors would like to apologize for this error and for any confusion that it may have caused.
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Herman et al. (2007) studied this question.