Left: Simplified view of endosomal trafficking pathways throughout the cell. The classical retromer pathway can be seen from the endosome to the TGN, as well as the pathway identified by Choy et al. (2014) from the endosome to the plasma membrane. Retromer tubules are shown in green.
Center: Structure and domains of a neuron.
Right: Model of dendritic receptor delivery to plasma membrane by retromer. β2ARs (blue) are delivered and function at the shaft, whereas neurotransmitter receptors such as AMPA- or NMDA-type glutamate receptors (red) function at the spine. Retromer tubules are shown in green.