Genebank accession numbers of cDNAs used are: NM_001025132 (CNIH-2), M38060.1 (GluA1i), NM_031608.1 (GluA1o), NM_017261.2 (GluA2i), NP_001077280.1 (GluA2o). All cDNAs were verified by sequencing. Dynamin-1 K44A [38] was a gift from S. L. Schmid, β-1,4-galactosyltransferase fused to GFP-A206K (GalTase-GFP; [30]) was generously provided by J. Lippincott-Schwartz.