Key points are not available for this paper at this time.
Tim Ulmasov, Jane Murfett, Gretchen Hagen, Tom J. Guilfoyle, Aux/IAA Proteins Repress Expression of Reporter Genes Containing Natural and Highly Active Synthetic Auxin Response Elements, The Plant Cell, Vol. 9, No. 11 (Nov., 1997), pp. 1963-1971
Ulmasov et al. (1997) studied this question.