We purchased mannosidase II rabbit polyclonal antibodies (Affinity Bioreagents, Golden, CO), Rab43 mouse monoclonal antibodies (Abnova, Taipei City, Taiwan), Rab43 rabbit polyclonal antibodies (Atlas Antibodies, Stockholm, Sweden), VAMP4 rabbit polyclonal antibodies (Sigma-Aldrich, St. Louis, MO), and protein disulfide isomerase mouse monoclonal antibodies (ThermoFisher, Waltham, MA). V5 antibodies and the various Alexa Fluor–conjugated secondary antibodies were obtained from Invitrogen (Waltham, MA), and secondary antibodies and actin mouse monoclonal antibodies were obtained from LI-COR. Endoglycosidase H was purchased from New England Biolabs (Ipswich, MA). The polyclonal VSV (Mire et al., 2010 (link)), AE1 (Adair-Kirk et al., 1999 (link)), and I1 anti-G monoclonal antibodies (Lefrancois and Lyles, 1982 (link)) have been described. COS7, AD293, and PH5CH8 cells (Ikeda et al., 1998 (link)) were grown in DMEM containing 10% fetal calf serum.