Anti-ATL2 rabbit polyclonal antibodies were custom-raised against the his6-tagged cytosolic domain (1−479 a.a.) of ATL2 (AbFrontier). These antibodies were affinity-purified using their antigens bound to SulfoLink resin (20401; Thermo Fisher Scientific). Anti-ATL3 rabbit polyclonal (ab117819; Abcam), anti-myc mouse monoclonal (2276S; Cell Signaling technology), anti-GFP mouse monoclonal (MA5-15256; Invitrogen), anti-Gluc rabbit polyclonal (E8023; New England BioLabs), anti-calnexin mouse monoclonal (sc-23954; Santa Cruz), anti-GAPDH mouse monoclonal (MA5-15738; Thermo Fisher Scientific), and anti-protein disulfide isomerase mouse monoclonal (MA3-019; Invitrogen) antibodies were purchased. Anti-Yet3p rabbit sera were a generous gift from C. Barlowe (Geisel School of Medicine at Dartmouth). Alexa Fluor 594-conjugated anti-mouse goat IgG (A-11005) was purchased from Invitrogen. Peroxidase-conjugated anti-mouse goat IgG (AB_10015289) and peroxidase-conjugated anti-rabbit goat IgG (AB_2313567) were purchased from Jackson ImmunoResearch.