Rabbit polyclonal antibodies to human SUN1 and SUN2 have been previously described (Turgay et al., 2010 (link); Sosa et al., 2012 (link)). Antibodies against GFP and human full-length NudE were generated in rabbits and affinity purified. The mouse monoclonal antibodies against α-tubulin (T5168) and β-actin (A1978) were purchased from Sigma-Aldrich. The rabbit polyclonal antibodies against BICD2 (ab73286), pericentrin (ab4448), and NudEL (ab25959) were purchased from Abcam. Rabbit polyclonal anti–β-actin (A2066) was obtained from Sigma-Aldrich, and mouse monoclonal anti–dynein intermediate chain (DIC; ab23905) was obtained from Abcam.