PT - JOURNAL ARTICLE AU - Lewis, Daniel R. AU - Miller, Nathan D. AU - Splitt, Bessie L. AU - Wu, Guosheng AU - Spalding, Edgar P. TI - Separating the Roles of Acropetal and Basipetal Auxin Transport on Gravitropism with Mutations in Two <em>Arabidopsis Multidrug Resistance-Like</em> ABC Transporter Genes AID - 10.1105/tpc.107.051599 DP - 2007 Jun 08 TA - The Plant Cell Online 4099 - http://www.plantcell.org/content/early/2007/06/08/tpc.107.051599.short 4100 - http://www.plantcell.org/content/early/2007/06/08/tpc.107.051599.full