Key points are not available for this paper at this time.
Bosl Noh, Angus S. Murphy, Edgar P. Spalding, Multidrug Resistance-Like Genes of Arabidopsis Required for Auxin Transport and Auxin-Mediated Development, The Plant Cell, Vol. 13, No. 11 (Nov., 2001), pp. 2441-2454
Noh et al. (Thu,) studied this question.