Neuritic localization of mGluR5 in cerebellar granule cells in the presence of Homer1a or Homer1b. A,Cerebellar neuron transfected with Myc–Homer1b and immunolabeled with anti-Myc antibody. B, C, Cerebellar neuron cotransfected with Myc–Homer1b and HA–mGluR5.B, Myc immunolabeling; C, HA immunolabeling in the same neuron as in B.D–F, Same legend as in A–C,respectively, but with epitope-tagged Homer1a.