Structure-function analysis of the presumptive Arabidopsis auxin permease AUX1. by Swarup, R, Kargul, J, Marchant, A, Zadik, D, Rahman, A, Mills, R, Yemm, A, May, S, Williams, L, Millner, P, Tsurumi, S, Moore, I, Napier, R, Kerr, I, Bennett, M