Bruce A. McClure, Gretchen Hagen, Christopher S. Brown, Melissa A. Gee, Tom J. Guilfoyle, Transcription, Organization, and Sequence of an Auxin-Regulated Gene Cluster in Soybean, The Plant Cell, Vol. 1, No. 2 (Feb., 1989), pp. 229-239
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McClure et al. (1989) studied this question.