Co-immunoprecipitation of DERL1 and bound proteins. A) Western blotting using the pelleted precipitates from immunoprecipitation. Blots were incubated, separately, with anti-DERL1 (1; C = DERL1 control), anti-MHC I (2), anti-VIMP (3), and anti-p97 (4) antibodies. B) Western blotting using the supernatant collected following co-immunoprecipitation. Blots were incubated with anti- MHC I (1), anti-VIMP (2), and anti-p97 (3) antibodies.