Figure 7
From: The PIN-FORMED (PIN) protein family of auxin transporters
Auxin distribution and PIN-dependent auxin-transport routes in the Arabidopsis thaliana root tip. Auxin distribution (depicted as a blue gradient) has been inferred from DR5 activity and indole-acetic acid (IAA) immunolocalization. The localization of auxin transporters is based on immunolocalization studies and on in vivo observations of proteins tagged with green fluorescent protein. Arrows indicate auxin flow mediated by a particular PIN transporter.